Checkmk Werk 14330: Fix possible ValueError on dashboards after update to 2.1

ID: 14330 Title: Fix possible ValueError on dashboards after update to 2.1 Component: Multisite Level: 1 Class: Bug fix Version: 2.2.0i1 If dashboards were created with a custom topic in version 2.0, the error "ValueError (invalid literal for int() with base 10: '')" could occur after updating to 2.1. Possible workaround was to change the topic of the affected dashboard to a builtin topic and run "cmk-update-config" as site user again. The dashboard should be ok after that and you can change back to the custom topic.