UnboundLocalError: local variable 'filters' referenced before assignment

```
$ ansible localhost -c local -m ali_instance_facts -a 'alicloud_region=us-east-1 availability_zone=us-east-1-a' -vvv
ansible 2.8.0b1.post0
config file = /etc/ansible/ansible.cfg
configured module search path = [u'/home/atodorov/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
ansible python module location = /home/atodorov/.virtualenvs/alibaba/lib/python2.7/site-packages/ansible
executable location = /home/atodorov/.virtualenvs/alibaba/bin/ansible
python version = 2.7.5 (default, Sep 12 2018, 05:31:16) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)]
Using /etc/ansible/ansible.cfg as config file
host_list declined parsing /etc/ansible/hosts as it did not pass it's verify_file() method
script declined parsing /etc/ansible/hosts as it did not pass it's verify_file() method
auto declined parsing /etc/ansible/hosts as it did not pass it's verify_file() method
Parsed /etc/ansible/hosts inventory source with ini plugin
META: ran handlers
<127.0.0.1> ESTABLISH LOCAL CONNECTION FOR USER: atodorov
<127.0.0.1> EXEC /bin/sh -c 'echo ~atodorov && sleep 0'
<127.0.0.1> EXEC /bin/sh -c '( umask 77 && mkdir -p "` echo /home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160 `" && echo ansible-tmp-1556112722.38-56948253796160="` echo /home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160 `" ) && sleep 0'
Using module file /home/atodorov/.virtualenvs/alibaba/lib/python2.7/site-packages/ansible/modules/cloud/alicloud/ali_instance_facts.py
<127.0.0.1> PUT /home/atodorov/.ansible/tmp/ansible-local-269724TbdZ6/tmpiCoiNO TO /home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py
<127.0.0.1> EXEC /bin/sh -c 'chmod u+x /home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/ /home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py && sleep 0'
<127.0.0.1> EXEC /bin/sh -c '/home/atodorov/.virtualenvs/alibaba/bin/python /home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py && sleep 0'
<127.0.0.1> EXEC /bin/sh -c 'rm -f -r /home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/ > /dev/null 2>&1 && sleep 0'
The full traceback is:
Traceback (most recent call last):
File "/home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py", line 114, in
_ansiballz_main()
File "/home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py", line 106, in _ansiballz_main
invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
File "/home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py", line 49, in invoke_module
imp.load_module('__main__', mod, module, MOD_DESC)
File "/tmp/ansible_ali_instance_facts_payload_qZeeM9/__main__.py", line 396, in
File "/tmp/ansible_ali_instance_facts_payload_qZeeM9/__main__.py", line 388, in main
File "/home/atodorov/.virtualenvs/alibaba/lib/python2.7/site-packages/footmark/ecs/connection.py", line 267, in get_all_instances
for inst in self.get_list_new(self.build_request_params(filters), ['Instances', Instance]):
UnboundLocalError: local variable 'filters' referenced before assignment

localhost | FAILED! => {
"changed": false,
"module_stderr": "Traceback (most recent call last):\n File \"/home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py\", line 114, in \n _ansiballz_main()\n File \"/home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py\", line 106, in _ansiballz_main\n invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n File \"/home/atodorov/.ansible/tmp/ansible-tmp-1556112722.38-56948253796160/AnsiballZ_ali_instance_facts.py\", line 49, in invoke_module\n imp.load_module('__main__', mod, module, MOD_DESC)\n File \"/tmp/ansible_ali_instance_facts_payload_qZeeM9/__main__.py\", line 396, in \n File \"/tmp/ansible_ali_instance_facts_payload_qZeeM9/__main__.py\", line 388, in main\n File \"/home/atodorov/.virtualenvs/alibaba/lib/python2.7/site-packages/footmark/ecs/connection.py\", line 267, in get_all_instances\n for inst in self.get_list_new(self.build_request_params(filters), ['Instances', Instance]):\nUnboundLocalError: local variable 'filters' referenced before assignment\n",
"module_stdout": "",
"msg": "MODULE FAILURE\nSee stdout/stderr for the exact error",
"rc": 1
}
```

This is with 1.11.0, here's my entire pip freeze b/c I've installed ansible 2.8 from GitHub:

```
aliyun-python-sdk-core==2.9.5
aliyun-python-sdk-ecs==4.11.0
aliyun-python-sdk-ess==2.3.0
aliyun-python-sdk-kms==2.6.0
aliyun-python-sdk-ossadmin==0.0.2
aliyun-python-sdk-rds==2.3.3
aliyun-python-sdk-slb==3.2.7
aliyun-python-sdk-vpc==3.0.2
ansible==2.8.0b1.post0
asn1crypto==0.24.0
certifi==2019.3.9
cffi==1.12.3
chardet==3.0.4
crcmod==1.7
cryptography==2.6.1
enum34==1.1.6
footmark==1.11.0
idna==2.8
importlib==1.0.4
ipaddress==1.0.22
Jinja2==2.10.1
MarkupSafe==1.1.1
oss2==2.6.1
pycparser==2.19
pycryptodome==3.8.1
PyYAML==5.1
requests==2.21.0
six==1.12.0
urllib3==1.24.2
```

Reproduce the failure with the Ansible ali_instance_facts command from the report, then inspect footmark/ecs/connection.py around get_all_instances at line 267. Confirm the filters handling for this request path and verify that the command completes without the UnboundLocalError.

Written by the indexing model from the issue text.