Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
*             if the maskValue is not one of the above.
	 */
	public void setPropertyBinding( String propName, String value )
			throws SemanticException
	{
		
		ElementPropertyDefn defn = (ElementPropertyDefn) getPropertyDefn( propName );
		if ( defn == null )
			throw new SemanticError( getElement( ), new String[]{propName},
					SemanticError.DESIGN_EXCEPTION_INVALID_PROPERTY_NAME );
		
		Module root = getElement( ).getRoot( );
		if ( root == null )
			throw new SemanticError( getElement( ),
					SemanticError.DESIGN_EXCEPTION_PROPERTY_BINDING_FORBIDDEN );
		assert root.getElementByID( getID( ) ) == getElement( );
		ArrayList bindingList = (ArrayList) root.getLocalProperty( root,
				Module.PROPERTY_BINDINGS_PROP );
		PropertyBinding binding = root.findPropertyBinding( getElement( ),
				propName );
		if ( bindingList == null )
		{
			if ( value == null )
				return;
			bindingList = new ArrayList( );
			root.setProperty( Module.PROPERTY_BINDINGS_PROP, bindingList );
		}
		defn = root.getPropertyDefn( Module.PROPERTY_BINDINGS_PROP );
		assert defn != null;
		PropertyCommand cmd = new PropertyCommand( module, root );