Hide the tags input field when it's empty

[nickvergessen]

Backport #1469#1477

@jancborchardt@MorrisJobke

[mention-bot]

@nickvergessen, thanks for your PR! By analyzing the annotation information on this pull request, we identified @Bugsbane, @jancborchardt and @BernhardPosselt to be potential reviewers

[jancborchardt]

Please also review @oparoz@schiessle because you reported the problem with the distracting tags field. :)

[MorrisJobke]

Please also review @oparoz@schiessle because you reported the problem with the distracting tags field. :)

@jancborchardt And you should also review it ;) (for every opened PR of yourself you should review 2 others ;))

[MorrisJobke]

Tested and works 👍

@MariusBluem@schiessle@blizzz@LukasReschke Please review

[blizzz]

Testes, works 👍