Werk #1833: jolokia_metrics.gc: fix recently introduced exception for missing variable

Component Checks & agents
Title jolokia_metrics.gc: fix recently introduced exception for missing variable
Date Jan 7, 2015
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 1.2.7i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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