Werk #2904: Improved error handling when custom url dashlets raise an exception

Component	User interface
Title	Improved error handling when custom url dashlets raise an exception
Date	Jan 20, 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 whole dashboards crashes when a "Custom URL dashlet" using a "Custom URL rendering function" raise an exception while calling that function.

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