Squish: catch plugin loader error if it occurs

...and stop execution of the current test case

Change-Id: I46ac21e79f643f6890b7303d08c204dcd9fa9386
Reviewed-by: Robert Loehning <robert.loehning@digia.com>

tests/system/suite_CSUP/tst_CSUP05/test.py

@@ -12,6 +12,8 @@ def main():
     templateDir = prepareTemplate(sourceExample)
     examplePath = os.path.join(templateDir, proFile)
     startApplication("qtcreator" + SettingsPath)
+    if not startedWithoutPluginError():
+        return
     # open example project
     openQmakeProject(examplePath)
     # wait for parsing to complete