If you forget to fill in the 'Planned host name' field in the test lab of QC that you are executing using this plugin, then the Jenkins job will fail.

I've added an if statement to the runtestset script which checks for this and sets the hostname to localhost by default if this value is missing. This is perfect for us as we have slave jenkins nodes on window boxes that execute QTP tests locally. (see lines 246 to 250 of attached runTestSet.vbs)