D6746: Fix check for missing engine in comic applet

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Current code would check the comic engine was not installed and not create the
  download dialog, but would still always try to show it. This would
  crash.
  
  BUG: 372313

TEST PLAN
  Code review

REPOSITORY
  R114 Plasma Addons

BRANCH
  Plasma/5.10

REVISION DETAIL
  https://phabricator.kde.org/D6746

AFFECTED FILES
  applets/comic/comic.cpp

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