Werk #14419: cisco_cpu_multiitem, cisco_fru_module_status: Fix crash in raw data parsing

For some devices, the check plugins cisco_cpu_multiitem and cisco_fru_module_status did not discover any services due to a crash in the parsing of the raw data. Instead, the Check_MK Discovery service reported: * Parsing of section cisco_cpu_multiitem failed * Parsing of section cisco_fru_module_status failed

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