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 1.4.0b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8p18 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

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