Fix frameworksintegration tests

[Alex Merry]

Fix the kdeplatformplugin_unittest, which fails on Jenkins.

The old code would attempt to cast a QVariant containing a QStringList
to a QString, and check it was empty.  This value was never meant to be
empty, but the test happened to succeed most of the time, because the
case fails for multiple-element stringlists (returning an empty string).
 This is not the case on Jenkins, however.

Attached patch does something a bit saner.

Alex
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