D20967: [UserMetaData] Add method to query which attributes are set

[Stefan Brüns]

bruns added a dependent revision: D21004: [UserMetaData] Shortcut attribute queries for the common case.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D20967

To: bruns, #baloo, #frameworks, astippich, ngraham
Cc: kde-frameworks-devel, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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