D20556: Keep empty Json metadata docs out of DocumentData DB

[Nathaniel Graham]

ngraham accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R293 Baloo

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20556

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