When a user defines an Issue ID which doesn't exist the plugin of course isn't able to submit a comment and leads to a failure. The plugin suggests so resubmit this comment. But of course each resubmit also leads to a failure. There should be a possibility to delete a saved comment from the "resend queue" or to correct the Issue ID (which I think is already possible by deleting/editing the corresponding XML file in the file system prior to resubmission?). Such an action should be logged.
Issue #703 resolved