D12905: KF5I18NMacros: Don't install an empty dir when no po files exist

[Heiko Becker]

heikobecker created this revision.
Restricted Application added a project: Frameworks.
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heikobecker requested review of this revision.

REVISION SUMMARY
  I saw this happen with kdecoration from git since
  64d9f92f6a8708814f414dda0bb0d0e91c27235f <https://phabricator.kde.org/R129:64d9f92f6a8708814f414dda0bb0d0e91c27235f>. The directory passed in
  its ki18n_install call doesn't exist, resulting in an empty
  directory (LOCALE_INSTALL_DIR) getting installed, which at least
  some packaging systems don't like.

TEST PLAN
  Tested with kdecoration from git and tarballs where podir
  exists

REPOSITORY
  R249 KI18n

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D12905

AFFECTED FILES
  cmake/KF5I18NMacros.cmake.in

To: heikobecker
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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