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

ID: 3416 Title: Avoid warning in cmc.log when rescheduling non-existing discovery check Component: Core & Setup Level: 1 Class: Bug Fix Version: 1.2.9i1 This avoids the folloing message: F+: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 F-: