D8333: fix some indenters from randomly invoking indent

[Sven Brauch]

brauch created this revision.
brauch added reviewers: KTextEditor, cullmann, dhaumann.
Restricted Application added projects: Kate, Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  If triggerCharacters was not set, toString() would return "undefined",
  making indenters trigger on u, n, d, e, f, i and n.

TEST PLAN
  Trigger chars are still set correctly for e.g. cmake.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D8333

AFFECTED FILES
  src/script/kateindentscript.cpp

To: brauch, #ktexteditor, cullmann, dhaumann
Cc: #frameworks, kevinapavew, cullmann, sars, dhaumann
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