Tweaks to avoid a spurious error in checkwiki
    
    We only report for QA:Testcase_workstation_core_applications if
    the workstation_core_applications module passes. That module is
    only scheduled *at all* when the desktop is GNOME; when running
    the test on KDE we just don't schedule it. This tweaks the passed
    test case calculation in report.py and checkwiki itself to be
    aware of this, so we don't get a logged warning or a spurious
    'No ResultRow found' result from checkwiki for this scenario.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>