Werk #8849: omd rm: Do not fail in case user not exists anymore

Component	Site management
Title	omd rm: Do not fail in case user not exists anymore
Date	Aug 13, 2019
Level	Trivial 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) 1.6.0b6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In case a user is about to be removed, e.g. during "omd rm" and the user is not existant in the user database, simply continue with the next step.

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