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

Komponente	Checks und Agenten
Titel	wrong command line argument usage in check_mail active check
Datum	02.03.2021
Checkmk-Editon	Checkmk Raw (CRE)
Checkmk-Version	2.0.0b8 2.1.0i1
Level	Kleine Änderung
Klasse	Bugfix
Kompatibilität	Kompatibel - benötigt kein manuelles Eingreifen

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.

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