D22818: Avoid crash if kicker plugin is used outside plasma context

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
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REVISION SUMMARY
  Code currently gets the applet interface object passed in explicitly,
  from this it gets the configuration via the metaobject system
  
  We always guard the appletConfig not being available, but never the
  appletInterface, resulting in crashes if used from qmlscene or any
  potential tests.

TEST PLAN
  Used from qmlscene

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D22818

AFFECTED FILES
  applets/kicker/plugin/appsmodel.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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