Checkmk Werk 14952: Fix microcore crash caused invalid data in history files

ID: 14952 Title: Fix microcore crash caused invalid data in history files Component: Core & setup Level: 1 Class: Bug fix Version: 2.3.0b1 If, for some reason, the history file data has been corrupted, the corrupted data may cause the microcore to crash. Such a malfunction initiates a potentially endless cycle of microcore's restarts and crashes: this behavior is a regression. The problem has been fixed in this release.