Werk #7886: dell_om_sensors: Fix crashing temperature check for certain devices not reporting crit values

Component	Checks & agents
Title	dell_om_sensors: Fix crashing temperature check for certain devices not reporting crit values
Date	Jun 29, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p14 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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