Werk #14466: Fix ValueError on usage of empty service level filter

Component	User interface
Title	Fix ValueError on usage of empty service level filter
Date	Aug 9, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If "Host service level" or "Service service level" was used without "From" and "To" values in views, the error "ValueError: invalid literal for int() with base 10: ''" occurred.

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