Werk #3416: Avoid warning in cmc.log when rescheduling non-existing discovery check

Component	Core & setup
Title	Avoid warning in cmc.log when rescheduling non-existing discovery check
Date	Apr 19, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This avoids the folloing message: var/log/cmc.log

2016-04-19 13:49:24 [4] Ignoring command SCHEDULE_FORCED_SVC_CHECK;10.1.1.199;Check_MK Discovery;1461066564: invalid parameters

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