Werk #8105: Fix exception when adding a PNP graph for a single service to a report

Component	Reporting & availability
Title	Fix exception when adding a PNP graph for a single service to a report
Date	Dec 2, 2014
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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