Checkmk Werk 15213: rest_api: time_period exception/active time_ranges default

ID: 15213 Title: rest_api: time_period exception/active time_ranges default Component: REST API Level: 1 Class: Bug fix Version: 2.2.0i1 When creating a time_period via the REST-API, the exception time_ranges field is not required, however if it's not provided, it will raise a key error. This werk adds an empty list as a default value, which aligns with the interface functionality of allowing an empty time_range value. The second fix is the same issue but for the active time_ranges field.