D19532: Don't crash when no contexts are present

[Dāvis Mosāns]

davispuh created this revision.
Herald added projects: Kate, Frameworks.
Herald added subscribers: kde-frameworks-devel, kwrite-devel.
davispuh requested review of this revision.

TEST PLAN
  1. Compiled
  2. Placed malformed XML in ~/.local/share/katepart5/syntax/
  3. Opened a file which uses that previously created highlighter

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  context

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

AFFECTED FILES
  src/lib/definition.cpp

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