Bug 212478 Exception occurs when preview the table including a Autotext
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
return null;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.birt.report.engine.ir.ReportItemVisitor#visitFreeFormItem(org.eclipse.birt.report.engine.ir.FreeFormItemDesign)
		 */
		public Object visitFreeFormItem( FreeFormItemDesign container,
				Object value )
		{
			BaseQueryDefinition query;
			if ( container.useCachedResult( ) )
			{
				query = getRefenceQuery( container );
				if ( query == null )
				{
					registerUnresolvedQueryReference( container );
					return null;
				}
			}
			else
			{
				query = createQuery( container, value );
			}
			for ( int i = 0; i < container.getItemCount( ); i++ )
				build( query, container.getItem( i ) );
			try
			{
				transformExpressions( container, query );
			}