solved issues when moving tasks

core/src/main/java/de/srsoftware/umbrella/core/model/Task.java

@@ -70,6 +70,10 @@ public class Task implements Mappable {
 		return estimatedTime;
 	}
 
+	public boolean hasMember(UmbrellaUser user) {
+		return members.containsKey(user.id());
+	}
+
 	public long id(){
 		return id;
 	}
@@ -215,8 +219,9 @@ public class Task implements Mappable {
 		return map;
 	}
 
-	public boolean hasMember(UmbrellaUser user) {
-		return members.containsKey(user.id());
-	}
 
+	@Override
+	public String toString() {
+		return name;
+	}
 }