D7078: [server] Fix crash when sending selection to a DDI without a DataSource

[Martin Flöser]

graesslin created this revision.
Restricted Application added projects: Plasma on Wayland, Frameworks.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  This crash got triggered in KWin when sending the selection to XWayland.
  While the test handles condition of not yet created I think in the KWin
  crash case it's no longer being there.
  
  BUG: 383054

TEST PLAN
  Adjusted test no longer crashes

REPOSITORY
  R127 KWayland

BRANCH
  fix-dataoffer-no-source

REVISION DETAIL
  https://phabricator.kde.org/D7078

AFFECTED FILES
  autotests/client/test_wayland_seat.cpp
  src/server/dataoffer_interface.cpp

To: graesslin, #kwin, #plasma, #frameworks
Cc: plasma-devel, leezu, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein, lukas
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