[Differential] [Request, 46 lines] D3191: guard against dataengine missing

[mart (Marco Martin)]

mart created this revision.
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REVISION SUMMARY
  this should never happen, but weird distribution packaging policies
  can make this happen. At least don't crash the whole sesison
  
  CCBUG:371779

TEST PLAN
  with dataengine present still works, with dataengine plugin delteted
  it still load without crashing, even if broken

REPOSITORY
  rKDEPLASMAADDONS Plasma Addons

BRANCH
  phab/checkengine

REVISION DETAIL
  https://phabricator.kde.org/D3191

AFFECTED FILES
  applets/comic/comic.cpp
  applets/comic/comicmodel.cpp

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: mart, #plasma
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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