Werk #5974: Fixed possible exception on background job detail page

Component	User interface
Title	Fixed possible exception on background job detail page
Date	Apr 12, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When a detail page can not access job information (e.g. the job does not exist anymore), the error message was not displayed correctly.

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