Checkmk Werk 12887: agent_prometheus: fixing cadvisor memory check when no valid memory limit was provided

ID: 12887 Title: agent_prometheus: fixing cadvisor memory check when no valid memory limit was provided Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 In the previous version, the machine memory was occasionally missing when the memory limit was 0. This werk fixes this behaviour to always provide the machine memory for this case.