D12118: Only install translations if they are available

[Heiko Becker]

heikobecker added a comment.


  In D12118#262921 <https://phabricator.kde.org/D12118#262921>, @ltoscano wrote:
  
  > This change should not be needed; ki18n_install is a noop operation if the directory does not exist - did you see any issue?
  
  
  Yeah, it tries to install an empty dir: '/usr/share/locale'

REPOSITORY
  R129 Window Decoration Library

REVISION DETAIL
  https://phabricator.kde.org/D12118

To: heikobecker, #plasma, graesslin, ltoscano
Cc: ltoscano, plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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