Werk #2538: Fix exception in PNP graph template where metric name contains colon (e.g. omd_apache)

Component	User interface
Title	Fix exception in PNP graph template where metric name contains colon (e.g. omd_apache)
Date	Aug 17, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This problem only appeared with Nagios/Icinga as core.

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