Werk #10107: CLI: Don't crash on manual parent scan from the command line without a specific host

Component	Core & setup
Title	CLI: Don't crash on manual parent scan from the command line without a specific host
Date	Sep 18, 2019
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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