Checkmk Werk 15206: DCD: resolve bug when hosts with locked attributes are included in Phase 2.2

ID: 15206 Title: DCD: resolve bug when hosts with locked attributes are included in Phase 2.2 Component: Dynamic host configuration Level: 1 Class: Bug fix Version: 2.2.0i1 Prior to this werk, DCD was unable to complete Phase 2.2 whenever the REST API returned host configs which included locked attributes. This werk resolves this issue and no further KeyError should appear in the DCD logs. The bug was previously introduced with werk 13640.