Allowing kicontheme tests to run without oxygen-icons

[Alex Merry]

Currently, kiconthemes tests fail on Jenkins, due to the absense of
oxygen-icons.  But I figured they shouldn't really depend on a theme
being installed anyway, so I altered the tests to not require it.

Reviewboard doesn't have the new repos yet, so patch is attached.

If this idea meets general approval, the same can be done for the
kxmlgui test that is currently failing.

Alex
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