Werk #6910: cisco_secure: Don't crash upon missing port status

Component	Checks & agents
Title	cisco_secure: Don't crash upon missing port status
Date	Nov 22, 2018
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) 1.5.0p8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The check now goes to unknown if the status cannot be determined.

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