Checkmk Werk 12084: wrong command line argument usage in check_mail active check

ID: 12084 Title: wrong command line argument usage in check_mail active check Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 Some command line arguments for the check_mail active check had been assembled in a way that allowed invalid values for {{forward_app}} or {{match_subject}}. Activating "Forward mails as events to Event Console" in WATO without specifying forward app or a regex for subject would provide the sting "None" to forward-app and leave {{match_subject}} empty resulting in an Unhandled exception: TypeError('first argument must be string or compiled pattern') This change fixes command line argument generation and checks for {{match_subject}} being set.