D9073: Don't try to generate metadata.json if there's no metadata.desktop

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: Plasma, Frameworks.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  In fact, if metadata.json is provided directly, that's all we need.

REPOSITORY
  R290 KPackage

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9073

AFFECTED FILES
  KF5PackageMacros.cmake
  src/kpackagetool/kpackagetool.cpp

To: apol, #plasma, #frameworks
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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