Checkmk Werk 12880: Fix ruleset "JVM memory levels"

ID: 12880 Title: Fix ruleset "JVM memory levels" Component: Setup Level: 1 Class: Bug fix Version: 2.1.0i1 A bug in the ruleset "JVM memory levels", which is used for defining levels on the memory usage of Java virtual machines, prevented the user from saving any defined levels. This has been fixed.