Checkmk Werk 14308: Fix "Invalid job status None found" message for background jobs

ID: 14308 Title: Fix "Invalid job status None found" message for background jobs Component: Multisite Level: 1 Class: Bug fix Version: 2.2.0b5 In case a job has just started and did not report any status update or was interrupted during startup the `jobstatus.mk` state file could be empty, resulting in the message Invalid job status None found in [PATH]". The handling of this situation has been improved by showing the initialized state in this situation.