D17315: Avoid potential nullptr access for Document, use reference instead

[Stefan Brüns]

bruns added a dependent revision: D17324: Move internal helper from BasicIndexingJob to anonymous namespace.

REPOSITORY
  R293 Baloo

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

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