Werk #4670: Fixed exception when trying to edit not existing BI aggregation

Component	BI
Title	Fixed exception when trying to edit not existing BI aggregation
Date	May 9, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p22 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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