Always record the git branch command as success

[humitos]

This is causing the build to be marked as FAILED when the repository
has no branches.

[humitos]

@stsewd @agjohnson I think I found the issue for #3644. Although, I wasn't able to reproduce it in my local instance (maybe because of the git version. 2.16.2 is mine)

I'm just supposing that git branch -r could be returning a non-zero exit code when no branches (as the comment in the code says) and that is marking the build as FAILED.

Could you help me by testing this PR manually in your local instance and let me know? Thanks!

[stsewd]

I tested this branch and the master branch; still the issue. But I almost couldn't replicated it on master, I was able to replicated it again wiping and building the version. Although, I think this is just a helper, since I was able to replicate it without wiping, yesterday. I believe is because is only visible when the process is slow, so on faster machines like @humitos is difficult to replicate.

[agjohnson]

This doesn't resolve the underlying issue, but this does resolve a separate bug with the build output page. LGTM!