[2.3.0] Checkmk Werk 17149 created: Fix sap_value check from crashing

[//]: # (werk v2) # Fix sap_value check from crashing key | value ---------- | --- date | 2024-07-10T15:16:35+00:00 version | 2.3.0p10 class | fix edition | cre component | checks level | 1 compatible | yes The `sap_value` check responsible for monitoring single SAP R/3 values caused a crash during service discovery. With this werk, the cause of the crash has been resolved.