Werk #8613: Fix exception when signing agent and a host once had an agent but now don't

Component	Agent bakery
Title	Fix exception when signing agent and a host once had an agent but now don't
Date	Jul 26, 2016
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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