D23147: KRun: fix runtime warning when widget is null

[David Faure]

dfaure created this revision.
dfaure added reviewers: nicolasfella, vkrause.
Herald added a project: Frameworks.
dfaure requested review of this revision.

REVISION SUMMARY
  I wanted the connection to be broken if the widget was deleted early,
  but if there's no widget then Qt warns about a null receiver. Use qApp
  as receiver in that case, just to have something non-null.

TEST PLAN
  kde-open5 file.pdf

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23147

AFFECTED FILES
  src/widgets/krun.cpp

To: dfaure, nicolasfella, vkrause
Cc: kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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