Werk #2901: Fixed issue editing availability annotations

Component	User interface
Title	Fixed issue editing availability annotations
Date	Jan 13, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Fixed a possible "Internal Server Error" when trying to edit annotations of the Check_MK Availability which contains special characters in the text.

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