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 Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

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