Exempt OSError for Tarball.get_installed_git_repo

[dachengx]

Without this PR, we will see:

Traceback (most recent call last):
  File "/home/xudc/tt.py", line 4, in <module>
    Tarball.get_installed_git_repo("rucio")
  File "/home/xudc/utilix/utilix/tarball.py", line 78, in get_installed_git_repo
    repo = Repo(mod.__path__[0], search_parent_directories=True)
  File "/cvmfs/xenon.opensciencegrid.org/releases/nT/el9.2024.09.1/anaconda/envs/XENONnT_el9.2024.09.1/lib/python3.9/site-packages/git/repo/base.py", line 236, in __init__
    raise NoSuchPathError(epath)
git.exc.NoSuchPathError: /cvmfs/xenon.opensciencegrid.org/releases/nT/el9.2024.09.1/anaconda/envs/XENONnT_el9.2024.09.1/lib/python3.9/site-packages/rucio_clients-32.8.0-py3.9.egg/rucio

This is because rucio is not an ordinarily installed package.