D7250: Avoid some unnecessary theme content lookups

[Fabian Vogt]

fvogt created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  imagePath can be an absolute path into an iconTheme
  -> Do not try to find it in the Plasma theme
  
  imagePath can be empty
  -> Do not try to look it up at all

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7250

AFFECTED FILES
  src/plasma/svg.cpp

To: fvogt
Cc: #frameworks
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