make koji: check remote tag exists beforehand

[busykai]

CC: @phmccarty

[phmccarty]

@busykai Similar to the feedback from @bryteise, I would like to hear about the scenario(s) where it is helpful to have this check.

Whenever I hit the case when a remote tag already exists, the git push command fails. Of course, checking git ls-remote --tags ... beforehand is helpful to produce a better error message, but otherwise, are your changes capturing additional scenarios I'm not thinking of?

[busykai]

Local tag is not created. There's no good reason to litter if you can avoid it.

[phmccarty]

Okay, that's fair. I just wanted to make sure there weren't any other scenarios I was not thinking of :-)

[phmccarty]

Fixed with cbb1d9688ebf9368e07b08b26d1648e5cd2f1f8a