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
}
			}
			else
			{
				switch ( columnIndex )
				{
					case 0 :
					{
						if ( paramHandle != newParameter )
						{
							String paramName;
							if ( paramHandle != selectedParameter )
							{
								paramName = paramHandle.getName( );
							}
							else
							{
								paramName = paramNameEditor.getText( ).trim( );
							}
							value = getDummyText( paramHandle ) + paramName;
						}
						break;
					}
					case 1 :
					{
						if ( paramHandle.getValueExpr( ) != null )
						{
							value = getColumnName( paramHandle.getValueExpr( ) );
						}
						else if ( getDataSetColumns( paramHandle ).length > 0 )