Azure: Check if version.tags is None

[ricardobranco777]

Fix for

Traceback (most recent call last):
  File "/pcw/ocw/lib/cleanup.py", line 21, in cleanup_run
    Azure(namespace).cleanup_all()
  File "/pcw/ocw/lib/azure.py", line 125, in cleanup_all
    self.cleanup_gallery_img_versions()
  File "/pcw/ocw/lib/azure.py", line 197, in cleanup_gallery_img_versions
    if Instance.TAG_IGNORE in version.tags:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: argument of type 'NoneType' is not iterable

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2ec1254) 78.59% compared to head (d90e9c2) 78.59%.
Report is 4 commits behind head on master.

Files	Patch %	Lines
ocw/lib/azure.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #355   +/-   ##
=======================================
  Coverage   78.59%   78.59%           
=======================================
  Files          22       22           
  Lines        1653     1653           
=======================================
  Hits         1299     1299           
  Misses        354      354           

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[asmorodskyi]

Thanks Ricardo ! Sorry for delay with review was busy with other things