Werk #7139: cisco_ip_sla: Don't crash upon vanished IP SLA

Component	Checks & agents
Title	cisco_ip_sla: Don't crash upon vanished IP SLA
Date	Feb 4, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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