D29352: [Plasmoid Heading] Draw the heading only when there is an SVG in the theme

[Filip Fila]

filipf edited the test plan for this revision.
filipf added reviewers: VDG, Plasma.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D29352

To: filipf, #vdg, #plasma
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns