Bug 161501 [Smoke] Chart can not be previewed in Web Viewer & HTML
Chart can not be previewed in Web Viewer & HTML Steps to reproduce: 1. Create a chart. 2. Preveiw in Web Viewer/ HTML. Expected result: Chart can be previewed. Actual result: No chart is shown.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
* 
	 * @param document
	 * @return the result sets from the document
	 * @throws RemoteException
	 */
	public ResultSet[] getResultSets( IReportDocument document )
			throws RemoteException
	{
		assert document != null;
		ResultSet[] resultSetArray = null;
		IDataExtractionTask dataTask = engine
				.createDataExtractionTask( document );
		try
		{
			List resultSets = dataTask.getResultSetList( );
			resultSetArray = new ResultSet[resultSets.size( )];
			if ( resultSets.size( ) > 0 )
			{
				for ( int k = 0; k < resultSets.size( ); k++ )
				{
					resultSetArray[k] = new ResultSet( );
					IResultSetItem resultSetItem = (IResultSetItem) resultSets
							.get( k );
					assert resultSetItem != null;
					resultSetArray[k].setQueryName( resultSetItem
							.getResultSetName( ) );
					IResultMetaData metaData = resultSetItem
							.getResultMetaData( );
					assert metaData != null;
					Column[] columnArray = new Column[metaData.getColumnCount( )];