Bug 135465 [smoke]An error occurred when new a casading Parameter
Description: An error occurred when new a casading Parameter Step to reproduce: 1.new a sample db data source and data set 2.New a cascading parameter group, named "gp1", 3.select the data set, then create two cascading parameters, one is row["customernumber"], named p1; the other is row["customername"] Actual result; error message occurred repeatly
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
Object actualElement = ( (TableItem) element ).getData( );
			try
			{
				saveParameterProperties( );
			}
			catch ( SemanticException e1 )
			{
				
				e1.printStackTrace( );
			}
			if ( COLUMN_NAME.equals( property ) )
			{
				try
				{
					if ( actualElement == newParameter )
					{
						( (ScalarParameterHandle) actualElement ).setName( newParameter.getName( ) );
					}
					else
					{
						( (ScalarParameterHandle) actualElement ).setName( (String) value );
					}
				}
				catch ( NameException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			else if ( COLUMN_VALUE.equals( property ) )
			{