do not glob a path if it exists 'unglobbed'

[sdementen]

fix #680

[Byron]

@sdementen Thanks a lot for your contribution! Unfortunately some tests seem to legitimately fail. Do you think that can be fixed?
If that should work out, it would be great to have a specific test as well that would fail the current change is not applied.
Thank you

[codecov-io]

Codecov Report

Merging #797 into master will increase coverage by 0.06%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #797      +/-   ##
==========================================
+ Coverage   94.71%   94.78%   +0.06%     
==========================================
  Files          59       59              
  Lines        9369     9602     +233     
==========================================
+ Hits         8874     9101     +227     
- Misses        495      501       +6

Impacted Files	Coverage Δ
git/index/base.py	94.52% <50%> (-0.11%)	⬇️
git/repo/base.py	95.37% <0%> (-0.83%)	⬇️
git/test/test_docs.py	100% <0%> (ø)	⬆️
git/objects/blob.py	100% <0%> (ø)	⬆️
git/refs/remote.py	100% <0%> (ø)	⬆️
git/test/test_diff.py	100% <0%> (ø)	⬆️
git/test/performance/test_streams.py	100% <0%> (ø)	⬆️
git/test/test_commit.py	100% <0%> (ø)	⬆️
git/test/test_tree.py	100% <0%> (ø)	⬆️
git/test/test_exc.py	100% <0%> (ø)	⬆️
... and 27 more

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[Byron]

Thanks a lot for your contribution thus far !
I am closing this PR due to prolonged inactivity. Please feel free to reopen it in case it can proceed.