Werk #16294: ibm_imm_temp: Fix ValueError (could not convert string to float: '')

Component	Checks & agents
Title	ibm_imm_temp: Fix ValueError (could not convert string to float: '')
Date	Nov 16, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p15 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p37 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

This werk fixes the crash mentioned above.

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