D9928: Fix one source of log spam referenced in Bug 388389 (Empty filename passed to function)

[Randy Kron]

rkron created this revision.
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REVISION SUMMARY
  I found two places in plasma-framework svg.cpp (Plasma::Svg) that were triggering this message.
  
  path variable was not being checked for empty before passing to QFile::exists().
  
  This seems to be one source of the issue reported in Bug 388389 <https://bugs.kde.org/show_bug.cgi?id=388389>

TEST PLAN
  Found that kicker was triggering this message and also plasmashell tooltips.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D9928

AFFECTED FILES
  src/plasma/svg.cpp

To: rkron, #frameworks
Cc: #frameworks
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