Werk #8791: cisco_secure: don't crash if the interface name cannot be resolved

Component	Checks & agents
Title	cisco_secure: don't crash if the interface name cannot be resolved
Date	Sep 3, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b9 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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