Update ChessSystemModel

Change-Id: I2e4657eb18f0c3d99c44c90f59e0cd854dee4e4c

plugins/org.polarsys.chess.service/src/org/polarsys/chess/service/core/model/ChessSystemModel.java

@@ -1014,6 +1014,11 @@ public class ChessSystemModel implements AbstractSystemModel {
 		return EntityUtil.getInstance().isBlockTypeAttribute(attributeName, (Class)blockAsClass);
 	}
 
+	@Override
+	public boolean isBlockType(Object type) {		
+		return EntityUtil.getInstance().isBlock((Element)type);
+	}
+	
 	@Override
 	public Object getAttributeBlockType(String attributeName, Object block) {
 		return EntityUtil.getInstance().getAttributeBlockType(attributeName,(Class)block);