D24514: [XembedSNIProxy] Do not crash on null pointer

[Konrad Materka]

kmaterka created this revision.
kmaterka added reviewers: Plasma: Workspaces, Plasma, davidedmundson.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
kmaterka requested review of this revision.

REVISION SUMMARY
  XCB may return null pointer as a response. Add a check to prevent
  segmentation fault.
  
  BUG: 356937

TEST PLAN
  It is hard to reproduce, but cause of the segmentation fault is pretty obvious thanks to debug dump from bug 409652

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D24514

AFFECTED FILES
  xembed-sni-proxy/fdoselectionmanager.cpp
  xembed-sni-proxy/fdoselectionmanager.h

To: kmaterka, #plasma_workspaces, #plasma, davidedmundson
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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