Add ImportError to catch GitPython import error

[vinnamkim]

Summary

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov]

Codecov Report

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

Comparison is base (19fb861) 79.96% compared to head (97295e8) 79.96%.

Additional details and impacted files

@@               Coverage Diff               @@
##           releases/1.5.0    #1186   +/-   ##
===============================================
  Coverage           79.96%   79.96%           
===============================================
  Files                 265      265           
  Lines               29705    29705           
  Branches             5831     5831           
===============================================
  Hits                23755    23755           
  Misses               4618     4618           
  Partials             1332     1332           

Flag	Coverage Δ
macos-11_Python-3.8	79.09% <0.00%> (ø)
ubuntu-20.04_Python-3.8	79.96% <0.00%> (ø)
windows-2022_Python-3.8	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/datumaro/util/os_util.py	66.66% <0.00%> (ø)

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[jihyeonyi]

LGTM, but is it possible to add unit test for this?

[vinnamkim]

LGTM, but is it possible to add unit test for this?

Used the administrator bypass option