WIP fix(ngMessages): fix orphaned ng-message comments when using ng-if

[CodySchaaf]

Pull request for help on issue #16389

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[frederikprijck]

@CodySchaaf It looks like your commit author isn't linked to your github account, you probably wanna fix that, despite this PR getting merged or not (it's useful for other PR's/repos aswel)

[Narretz]

@CodySchaaf the PR should have the master branch as merge target, not 1.5.x. We merge all PRs into master first, because that's the most up to date code. We actually don't update 1.5.x. anymore, only master and 1.6.x

Can you also add a test case in ngMessagesSpec that is fixed by this change? You should be able to adapt one of the tests.

[petebacondarwin]

I think #16406 should fix this issue