D19532: Don't crash when no contexts are present

[Christoph Cullmann]

This revision was automatically updated to reflect the committed changes.
Closed by commit R216:7289a7088065: fix highlighter crash for broken hl file (authored by cullmann).

CHANGED PRIOR TO COMMIT
  https://phabricator.kde.org/D19532?vs=53234&id=53517#toc

REPOSITORY
  R216 Syntax Highlighting

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D19532?vs=53234&id=53517

REVISION DETAIL
  https://phabricator.kde.org/D19532

AFFECTED FILES
  autotests/input/syntax/brokenlang.xml
  autotests/syntaxrepository_test.cpp
  autotests/test-config.h.in
  src/lib/abstracthighlighter.cpp

To: davispuh, cullmann, dhaumann, vandenoever, vkrause
Cc: kwrite-devel, kde-frameworks-devel, gennad, domson, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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