Werk #8161: Fix exception in reporting when rendering icons or images

Component	Reporting & availability
Title	Fix exception in reporting when rendering icons or images
Date	Feb 25, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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