D6518: guard against themes without a valid shadow

[Marco Martin]

mart created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  some themes don't have a valid shadow, which would lead
  to a crash in kwayland, don't even try to render a shadow
  if one of the elements is missing
  
  BUG:381953

TEST PLAN
  Doesn't crash anymore, i can't hellp but think something should be
  fixed in kwayland as well

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6518

AFFECTED FILES
  src/plasmaquick/dialogshadows.cpp

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