Validate if its a git repository or not before triggering git commands.

[rhoml]

closes #2883

[ncanceill]

Thanks for the fix — which needs testing.

It is good practice to notify the original developers of the theme/plugin/thingy that you want to update, like so:
@dlobraico @pilif

[mcornella]

This might be a good time to discuss #2317 and #2321.
/CC @richardtsai @haneefmubarak

[haneefmubarak]

...how do #2317 and #2321 relate to this?

[mcornella]

This modifies the pygmalion theme

[dlobraico]

Thanks for the notification @ncanceill, sounds good to me.

[ncanceill]

Cool! So this looks nice, but @rhoml please try to look into other PRs related to the pygmalion theme, and to aggregate the changes.

[mcornella]

Hey all, this method to check if we're in a git repository was seen to be buggy. See #1504 and #3091.
Please close

[webknjaz]

In fact, this check doesn't take into account that user may have a --separate-git-dir. And in this case it would be a file containing a reference, like: gitdir: /path/to/real/repo

https://git-scm.com/docs/git-clone#git-clone---separate-git-dirltgitdirgt