D20556: Keep empty Json metadata docs out of DocumentData DB

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, Frameworks, astippich, ngraham, poboiko.
Herald added projects: Frameworks, Baloo.
Herald added a subscriber: kde-frameworks-devel.
bruns requested review of this revision.

REVISION SUMMARY
  In case a document is marked for content indexing, but none of the
  extractors returns any data, the Baloo::Result::finish() method will
  serialize the data as an empty Json document, "{}".
  
  Having no data for a document in the DB is no error, this is the case
  already when content indexing is disabled or when the indexer has not
  yet processed the document, so leave it out to save some space.

REPOSITORY
  R293 Baloo

BRANCH
  master

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

AFFECTED FILES
  src/file/extractor/result.cpp
  src/lib/file.cpp

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