Checkmk Werk 12890: dcd: solve error when custom dcd connectors are installed

ID: 12890 Title: dcd: solve error when custom dcd connectors are installed Component: Core & setup Level: 1 Class: Bug fix Version: 2.1.0i1 The configuration of a custom DCD connector was possible, but resulted in an error when the activate changes was attempted. The error message claimed that the connector does not exist. This werk fixes this behaviour.