D9749: Simplify code: return early to reduce indentation depth

[Milian Wolff]

mwolff created this revision.
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REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D9749

AFFECTED FILES
  src/completion/expandingtree/expandingwidgetmodel.cpp

To: mwolff, #kate
Cc: #frameworks, michaelh, kevinapavew, ngraham, demsking, cullmann, sars, dhaumann
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