Werk #8747: Fixed error in availability PDF export.

Component	Reporting & availability
Title	Fixed error in availability PDF export.
Date	Feb 21, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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