[AIRFLOW-4754] Fixed failure when no .git repo is found

[potiuk]

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[potiuk]

Hey @BasPH - the last commit with pylint for setup.py broke builds when no .git repo is checked out (which is the case for docker image build in DockerHub). This commit should fix it.

[codecov-io]

Codecov Report

Merging #5396 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5396   +/-   ##
=======================================
  Coverage   79.03%   79.03%           
=======================================
  Files         481      481           
  Lines       30215    30215           
=======================================
  Hits        23879    23879           
  Misses       6336     6336

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[potiuk]

@BasPH -> i need that one to check that the dockerfile builds as needed on DockerHub.

[BasPH]

Whoops, thanks for the fix!