Ignore isEmpty methods in MgmtTargetAttributes and MgmtDistributionSetAssignments in order to avoid invalid schematic (#1794)

hawkbit-rest/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/target/MgmtDistributionSetAssignments.java

@@ -13,6 +13,7 @@ import java.io.Serial;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import lombok.NoArgsConstructor;
 
@@ -49,4 +50,10 @@ public class MgmtDistributionSetAssignments extends ArrayList<MgmtDistributionSe
     public MgmtDistributionSetAssignments(final List<MgmtDistributionSetAssignment> assignments) {
         super(assignments);
     }
+
+    @Override
+    @JsonIgnore
+    public boolean isEmpty() {
+        return super.isEmpty();
+    }
 }

hawkbit-rest/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/target/MgmtTargetAttributes.java

@@ -3,6 +3,8 @@
  */
 package org.eclipse.hawkbit.mgmt.json.model.target;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
 import java.io.Serial;
 import java.util.HashMap;
 import java.util.Map;
@@ -14,4 +16,10 @@ public class MgmtTargetAttributes extends HashMap<String, String> {
 
     @Serial
     private static final long serialVersionUID = 1L;
+
+    @Override
+    @JsonIgnore
+    public boolean isEmpty() {
+        return super.isEmpty();
+    }
 }