Werk #8426: Fix PDF export of graph overview page

Component	Reporting & availability
Title	Fix PDF export of graph overview page
Date	Feb 26, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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