Recording returning immediately from aborted edge, no data and no error

The behavior is that running:

```
kapacitor record stream -task cpu_alert -duration 20m
```

returns immediately, the status of the recording is `finished` but logs show the edge was aborted and no error shows up in the logs either.

Task:

```
stream
// Select just the cpu measurement from our example database.
|from()
.database('cp')
.measurement('user_cp')
|window()
.period(15m)
.every(15m)
|alert()
//.crit(lambda: "usage_idle" < 100)
// Whenever we get an alert write it to a file.
.info(lambda: "cp" > 150.0)
.log('/tmp/alerts.log')
```

[Logs](https://github.com/influxdata/kapacitor/files/533960/CyQN1Eyf.txt)
[Stack Trace](https://github.com/influxdata/kapacitor/files/533961/DAqRwUbi.txt)

Reproduce the issue with `kapacitor record stream -task cpu_alert -duration 20m` and review the linked logs and stack trace first. Trace why the recording reports `finished` after the edge is aborted; it is done when the failure is surfaced as an error instead of silently returning with no data.

Written by the indexing model from the issue text.