try/except block to handle use-cases without git

[mathematicalmichael]

ran into an issue trying to build a container (which did not depend on git cloning an "eden app"), and currently the code will bail out on git.Repo. This proposed change allows for overriding the need for git to be installed by setting an environment variable, and allows for successful server responses without it.

[codecov-commenter]

Codecov Report

Merging #40 (fca926b) into master (04b6b3d) will decrease coverage by 0.56%. The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage   69.04%   68.49%   -0.56%     
==========================================
  Files          22       24       +2     
  Lines         588      657      +69     
==========================================
+ Hits          406      450      +44     
- Misses        182      207      +25     

see 2 files with indirect coverage changes

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[mathematicalmichael]

I tested this change with the same COPY directive as in #41 and can confirm that this change allows a container to be built without git installed if ENV GIT_PYTHON_REFRESH=quiet is set in the Dockerfile.