Werk #12288: Prometheus: Fix javascript error when configuring PromQL queries

Component	Setup
Title	Prometheus: Fix javascript error when configuring PromQL queries
Date	Mar 9, 2021
Checkmk Editon	Checkmk Raw (CRE)
Checkmk Version	2.0.0p1 2.1.0i1
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed

When trying to configure the option "Service creation using PromQL queries" in the Prometheus special agent a javascript popup appeared with an error message like "cmk.valuespecs.transfer_context_onchange() ...".

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