[Bug Fix] Fix protected branches current configuration access level fetching

[BenKuhar]

The get_current_permissions method in branch_protector.py does not properly account for returned access_levels when they are set to 0.

This PR just adds a verification that the access_level value is present, otherwise the if check becomes if 0: when the 0 access level is set, which equates to False, resulting in unnecessary reapplications of branch protection settings.

[codecov-commenter]

Codecov Report

Merging #474 (267ee06) into main (dca1cd0) will increase coverage by 4.13%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #474      +/-   ##
==========================================
+ Coverage   76.73%   80.87%   +4.13%     
==========================================
  Files          70       70              
  Lines        2635     2635              
==========================================
+ Hits         2022     2131     +109     
+ Misses        613      504     -109     

Impacted Files	Coverage Δ
gitlabform/processors/util/branch_protector.py	60.68% <100.00%> (-1.71%)	⬇️
gitlabform/lists/filter.py	97.72% <0.00%> (+2.27%)	⬆️
gitlabform/gitlab/__init__.py	100.00% <0.00%> (+2.38%)	⬆️
gitlabform/processors/abstract_processor.py	84.61% <0.00%> (+16.92%)	⬆️
gitlabform/configuration/core.py	82.60% <0.00%> (+19.25%)	⬆️
gitlabform/configuration/transform.py	88.46% <0.00%> (+23.71%)	⬆️
gitlabform/configuration/groups.py	100.00% <0.00%> (+39.21%)	⬆️
gitlabform/processors/util/difference_logger.py	81.81% <0.00%> (+45.45%)	⬆️

[gdubicki]

Hey @BenKuhar! Thank you for your contribution! But could you please also add a test using your new code that will show that the bug is fixed?

[BenKuhar]

Hey @BenKuhar! Thank you for your contribution! But could you please also add a test using your new code that will show that the bug is fixed?

Added, let me know if any other changes are needed.

[gdubicki]

Released in v3.3.4.