Werk #12870: Jira: Make site custom field ID optional

Component	Notifications
Title	Jira: Make site custom field ID optional
Date	May 31, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p6 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p25 Checkmk Enterprise (CEE), Checkmk MSP (CME)

Werk #11202 introduced the option "Site custom field ID", which was mandatory instead of optional.

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