Werk #15478: Fix possible error in availability

Component	User interface
Title	Fix possible error in availability
Date	Apr 20, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b5 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p27 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Since 2.1.0p25 the availabilty could show an error like "Internal error: local variable 'this_until_time' referenced before assignment" if you used a time range other than "Last month".

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