Werk #11678: 'local' plugin crashed upon missing data on cluster

This change affects users who write local checks. The 'local' plugin crashed when configured on a cluster and no nodes sent data for a service. This has been fixed, and the service now shows the generic "Item not found in monitoring data" message in that case. If your check does not use the 'P' option, but you want the graphs to show WARN and CRIT information, then you need to change the 'P' option on.

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