Explicitly catch the InvalidGitRepositoryError when trying to get the repo information.

[sww]

If pytextrank is installed via pip, importing pytextrank prints out the root directory where it's installed.

Steps To Reproduce

With Docker using the python:3.12 image, run:

$ pip install pytextrank
$ python -c "import pytextrank"
/usr/local/lib/python3.12/site-packages
$ pip freeze | grep pytextrank
pytextrank==3.3.0

Discussion

The code https://github.com/DerwenAI/pytextrank/blob/5a92184d0b8c4954fcda0a85690e57bf752dd407/pytextrank/version.py#L21-L28 is trying to load git information from the installed location, but since there isn't a git repo there, it just prints the InvalidGitRepositoryError exception arguments, which is just a path.

By explicitly catching that exception, it should no longer print out some unnecessary information. This PR will still raise an other unexpected exceptions, though.