Werk #12755: Fix AssertionError if escalation is used in flexible notifications

Component	Notifications
Title	Fix AssertionError if escalation is used in flexible notifications
Date	Apr 30, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If flexible notifications with option "Restrict to nth to mth notification (escalation)" were used, notifications failed with an AssertionError in notify.log.

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