Werk #13708: bluecoat_sensors: Fix "TypeError ('NoneType' object is not iterable)"

Component	Checks & agents
Title	bluecoat_sensors: Fix "TypeError ('NoneType' object is not iterable)"
Date	Jan 26, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p20 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The check plugin bluecoat_sensors crashed with TypeError ('NoneType' object is not iterable) for some sensors.

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