Werk #11902: Fix crash in Rittal CMC III temperature check

Component Checks & agents
Title Fix crash in Rittal CMC III temperature check
Date Feb 1, 2021
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.0.0p16 2.1.0b1
Level Trivial Change
Class Bug Fix
Compatibility Incompatible - Manual interaction might be required

Some entries (such as the ones for the blue LED) do not report their temperatures. However, the missing temperature would crash the check.

Note: The device must be rediscovered.

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