make debconf compare apples to apples (booleans)

[bcoca]

hope to fix #25481

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

modules/debconf

[chemnic]

I think this is causing the following error:

MODULE_STDERR:

Traceback (most recent call last):
  File "<stdin>", line 114, in <module>
  File "<stdin>", line 106, in _ansiballz_main
  File "<stdin>", line 49, in invoke_module
  File "/usr/lib/python3.5/imp.py", line 234, in load_module
    return load_source(name, filename, file)
  File "/usr/lib/python3.5/imp.py", line 170, in load_source
    module = _exec(spec, sys.modules[name])
  File "<frozen importlib._bootstrap>", line 626, in _exec
  File "<frozen importlib._bootstrap_external>", line 665, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/tmp/ansible_debconf_payload_1rgqczcg/__main__.py", line 191, in <module>
  File "/tmp/ansible_debconf_payload_1rgqczcg/__main__.py", line 164, in main
UnboundLocalError: local variable 'existing' referenced before assignment

[bcoca]

@chemnic i cannot reproduce, please open a new issue with a reproducer

[bcoca]

nvmd, foudn it .. i should test with 'non boolean'

fix b0ddb88

[chemnic]

Yes. Fixed. Thank you.