Haproxy configuration is blank

Hi,

I have the following template:

```
]# cat template.tmpl

# HTTP Frontends
frontend http
mode http
bind 0.0.0.0:80
option httplog

{{range ls "marathon"}}
{{with $root := .}}{{with $app := parseJSON $root.Value}}{{with $tasks := ls (printf "marathon/%s/tasks" $root.Key)}}
{{if eq (print $app.labels.HAPROXY_HTTP) "true"}}
# {{$root.Key}} ACLs
{{range $index, $port := $app.ports}}{{with $localName := index $app.labels (printf "HTTP_PORT_IDX_%d_NAME" $index)}}
acl host_{{$localName}} hdr_beg(host) -i {{$localName}}
{{if and (eq (print $app.labels.HTTP_PATH) "true") $app.labels.HTTP_PATH_URL $app.labels.HTTP_PATH_URI}}
acl host_{{printf $app.labels.HTTP_PATH_URL}} path_beg -i {{printf $app.labels.HTTP_PATH_URI}}
use_backend {{printf $app.labels.HTTP_PATH_URL}}_backend if host_{{$localName}} host_{{printf $app.labels.HTTP_PATH_URL}}
{{else}}
use_backend {{$localName}}_backend if host_{{$localName}}
{{end}}
{{else}}
# no HTTP forwarding information for {{$port}}
{{end}}{{end}}
{{end}}
{{else}}
# no tasks for {{$root.Key}}, not generating any HTTP ACLs
{{end}}{{else}}{{end}}{{end}}{{/* end of with $root, $app, and $tasks */}}
{{end}}{{/* end of range "marathon" */}}
```

Consul Config Dir
```
]# cat config/consul.cfg
consul = "xx.xx.xx.xx:8500"
]# cat config/haproxy.cfg
template {
source = "/temp/consul-template/template.tmpl"
destination = "/temp/consul-template/haproxy.cfg"
}
```

Here is the command to run Consul-template

```
./consul-template -config /temp/consul-template/config -log-level info -wait 2s:10s
```

And this the log generated ( info and debug level)

INFO
```
2019/01/17 10:04:14 [INFO] consul-template v0.14.0
2019/01/17 10:04:14 [INFO] (runner) creating new runner (dry: false, once: false)
2019/01/17 10:04:14 [INFO] (runner) creating consul/api client
2019/01/17 10:04:14 [INFO] (runner) creating vault/api client
2019/01/17 10:04:14 [INFO] (runner) creating Watcher
2019/01/17 10:04:14 [INFO] (runner) starting
2019/01/17 10:04:14 [INFO] (runner) running
2019/01/17 10:04:14 [INFO] (runner) was not watching 2 dependencies
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon)"
2019/01/17 10:04:14 [INFO] (runner) diffing and updating dependencies
2019/01/17 10:04:14 [INFO] (runner) watching 1 dependencies
2019/01/17 10:04:14 [INFO] (view) "storeKeyPrefix(marathon)" received data
2019/01/17 10:04:14 [INFO] (runner) running
2019/01/17 10:04:14 [INFO] (runner) was not watching 8 dependencies
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)"
2019/01/17 10:04:14 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)"
2019/01/17 10:04:14 [INFO] (runner) diffing and updating dependencies
2019/01/17 10:04:14 [INFO] (runner) watching 5 dependencies
2019/01/17 10:04:14 [INFO] (view) "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)" received data
2019/01/17 10:04:14 [INFO] (runner) running
2019/01/17 10:04:14 [INFO] (view) "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)" received data
2019/01/17 10:04:14 [INFO] (view) "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)" received data
2019/01/17 10:04:14 [INFO] (view) "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)" received data
2019/01/17 10:04:14 [INFO] (runner) missing data for 3 dependencies
2019/01/17 10:04:14 [INFO] (runner) diffing and updating dependencies
2019/01/17 10:04:14 [INFO] (runner) watching 5 dependencies
2019/01/17 10:04:14 [INFO] (runner) running
2019/01/17 10:04:14 [INFO] (runner) diffing and updating dependencies
2019/01/17 10:04:14 [INFO] (runner) watching 5 dependencies
```

DEBUG
```
2019/01/17 10:05:13 [INFO] (runner) creating consul/api client
2019/01/17 10:05:13 [DEBUG] (runner) setting consul address to xx.xx.xx.xx:8500
2019/01/17 10:05:13 [INFO] (runner) creating vault/api client
2019/01/17 10:05:13 [DEBUG] (runner) enabling vault SSL
2019/01/17 10:05:13 [INFO] (runner) creating Watcher
2019/01/17 10:05:13 [INFO] (runner) starting
2019/01/17 10:05:13 [DEBUG] (runner) running initial templates
2019/01/17 10:05:13 [INFO] (runner) running
2019/01/17 10:05:13 [DEBUG] (runner) checking template /temp/consul-template/template.tmpl
2019/01/17 10:05:13 [INFO] (runner) was not watching 2 dependencies
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon)" starting
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon)" already exists, skipping
2019/01/17 10:05:13 [INFO] (runner) diffing and updating dependencies
2019/01/17 10:05:13 [INFO] (runner) watching 1 dependencies
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:0 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon)") Consul returned 9 key pairs
2019/01/17 10:05:13 [INFO] (view) "storeKeyPrefix(marathon)" received data
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:212907 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] (runner) receiving dependency "storeKeyPrefix(marathon)"
2019/01/17 10:05:13 [INFO] (runner) running
2019/01/17 10:05:13 [DEBUG] (runner) checking template /temp/consul-template/template.tmpl
2019/01/17 10:05:13 [INFO] (runner) was not watching 8 dependencies
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)" starting
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)" starting
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)" starting
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/xxxx-test-apps-test-cerebro/tasks)" starting
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)" already exists, skipping
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/mesos-marathon-consul/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:0 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:0 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)"
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-haproxy-https/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:0 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)" already exists, skipping
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)" already exists, skipping
2019/01/17 10:05:13 [INFO] (watcher) adding "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)"
2019/01/17 10:05:13 [DEBUG] (watcher) "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)" already exists, skipping
2019/01/17 10:05:13 [INFO] (runner) diffing and updating dependencies
2019/01/17 10:05:13 [DEBUG] (runner) "storeKeyPrefix(marathon)" is still needed
2019/01/17 10:05:13 [INFO] (runner) watching 5 dependencies
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:0 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-haproxy-https/tasks)") Consul returned 1 key pairs
2019/01/17 10:05:13 [INFO] (view) "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)" received data
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/mesos-marathon-consul/tasks)") Consul returned 1 key pairs
2019/01/17 10:05:13 [INFO] (view) "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)" received data
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)") Consul returned 1 key pairs
2019/01/17 10:05:13 [INFO] (view) "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)" received data
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/mesos-marathon-consul/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:210734 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)") Consul returned 2 key pairs
2019/01/17 10:05:13 [INFO] (view) "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)" received data
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:210730 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] (view) "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)" starting fetch
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-haproxy-https/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:212907 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] ("storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)") querying consul with &{Datacenter: AllowStale:true RequireConsistent:false WaitIndex:212797 WaitTime:1m0s Token: Near:}
2019/01/17 10:05:13 [DEBUG] (runner) receiving dependency "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)"
2019/01/17 10:05:13 [DEBUG] (runner) receiving dependency "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)"
2019/01/17 10:05:13 [DEBUG] (runner) receiving dependency "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)"
2019/01/17 10:05:13 [DEBUG] (runner) receiving dependency "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)"
2019/01/17 10:05:13 [INFO] (runner) running
2019/01/17 10:05:13 [DEBUG] (runner) checking template /temp/consul-template/template.tmpl
2019/01/17 10:05:13 [DEBUG] (runner) checking ctemplate &{Source:/temp/consul-template/template.tmpl Destination:/temp/consul-template/haproxy.cfg Command: CommandTimeout:30s Perms:-rw-r--r-- Backup:false}
2019/01/17 10:05:13 [DEBUG] (runner) wouldRender: true, didRender: false
2019/01/17 10:05:13 [INFO] (runner) diffing and updating dependencies
2019/01/17 10:05:13 [DEBUG] (runner) "storeKeyPrefix(marathon/xxx-test-apps-sampleapptest/tasks)" is still needed
2019/01/17 10:05:13 [DEBUG] (runner) "storeKeyPrefix(marathon/xxx-test-apps-test-cerebro/tasks)" is still needed
2019/01/17 10:05:13 [DEBUG] (runner) "storeKeyPrefix(marathon/mesos-marathon-consul/tasks)" is still needed
2019/01/17 10:05:13 [DEBUG] (runner) "storeKeyPrefix(marathon)" is still needed
2019/01/17 10:05:13 [DEBUG] (runner) "storeKeyPrefix(marathon/xxx-haproxy-https/tasks)" is still needed
2019/01/17 10:05:13 [INFO] (runner) watching 5 dependencies
```

The haproxy.cfg is coming blank

## Consul Template version
consul-template v0.14.0
## Consul Version
Consul v0.8.3
## Marathon Version
1.7.X

## Actual behavior
```
It should create one ACL and corresponding Backend entry in haproxy.cfg
(One of the app has this Marathon label true HAPROXY_HTTP)
```

Please assist and let me know if you need any other info from my side.

Thanks
Rahul

Start by reproducing the blank output with template.tmpl, config/consul.cfg, config/haproxy.cfg, and the shown consul-template command. Compare the rendered file with the Consul keys and the INFO/DEBUG dependency logs; done means identifying why the HAProxy configuration is empty and verifying the corrected output.

Written by the indexing model from the issue text.