Werk #4349: cisco_qos: Fix crashing check for some cases where the QoS class cannot be found

Component	Checks & agents
Title	cisco_qos: Fix crashing check for some cases where the QoS class cannot be found
Date	Feb 22, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The check will still return Unknown, but no longer crash.

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