Werk #7091: brocade_optical: Fixed KeyError caused by incomplete agent data

Component	Checks & agents
Title	brocade_optical: Fixed KeyError caused by incomplete agent data
Date	Jan 17, 2019
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

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