D8992: Warn about errors when parsing json files

[Aleix Pol Gonzalez]

apol created this revision.
apol added a reviewer: Frameworks.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  If it didn't parse properly, we'd better know first.

TEST PLAN
  Managed to figure out what was wrong with my file

REPOSITORY
  R244 KCoreAddons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8992

AFFECTED FILES
  src/lib/plugin/kpluginmetadata.cpp

To: apol, #frameworks
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