D17315: Avoid potential nullptr access for Document use reference instead

[Stefan Brüns]

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

REVISION SUMMARY
  Using a TermGenerator without backing document is pointless and can
  even crash when the document has been initialized with a nullptr.

TEST PLAN
  ctest

REPOSITORY
  R293 Baloo

BRANCH
  submit

REVISION DETAIL
  https://phabricator.kde.org/D17315

AFFECTED FILES
  autotests/integration/querytest.cpp
  autotests/unit/engine/termgeneratortest.cpp
  src/engine/termgenerator.cpp
  src/engine/termgenerator.h
  src/file/basicindexingjob.cpp
  src/file/extractor/result.cpp

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