D6718: Fix occasional abort in the krunner plugin

[Fabian Vogt]

fvogt created this revision.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  Sometimes the DBus reply has no arguments, so avoid trying to access them.

TEST PLAN
  No crashes so far.

REPOSITORY
  R856 Plasma Browser Integration

BRANCH
  crashfix (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D6718

AFFECTED FILES
  tabsrunner/tabsrunner.cpp

To: fvogt, #plasma, broulik, davidedmundson
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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