D21965: Avoid crash without XWayland

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  readX11ShadowProperty fails without an X connection

TEST PLAN
  Tested by Kai who didn't have xwayland

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D21965

AFFECTED FILES
  shadow.cpp

To: davidedmundson, #kwin
Cc: kwin, LeGast00n, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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