tags: avoid generating commit for an already deleted tag (
issue5752)
`$ hg tag --remove <tagname>` will keep on generating commits
regardless of checking whether the tag is deleted or not. I added a
a fix for `global` tags by aborting if `nullid` is already mapped
to the tag that is to be deleted.
Differential Revision: https://phab.mercurial-scm.org/D5780
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