Bug 141950 Selection of select value in data set filter is error
Details: Selection of select value in data set filter is error Step: 1.New a report design. 2.Create a sample datasource and dataset. 3.Switch to filter. 4.Select a value in expression. 5.Drop the list of the value1 and select <select value...> Actual result: No value is appear and pop up an error. It said that "An expression has not been set"
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
boolean useColumnHints, boolean useFilters ) throws BirtException
	{
		if ( dataSet != null )
		{
			DataRequestSession session = getDataRequestSession( dataSet );
			IBaseDataSetDesign dataSetDesign = session.getModelAdaptor( )
					.adaptDataSet( dataSet );
			if ( !useColumnHints )
			{
				dataSetDesign.getResultSetHints( ).clear( );
			}
			if ( !useFilters )
			{
				dataSetDesign.getFilters( ).clear( );
			}
			if ( !( dataSet instanceof JointDataSetHandle ) )
			{
				IBaseDataSourceDesign dataSourceDesign = session.getModelAdaptor( )
						.adaptDataSource( dataSet.getDataSource( ) );
				session.defineDataSource( dataSourceDesign );
			}
			if ( dataSet instanceof JointDataSetHandle )
			{
				defineSourceDataSets( dataSet, dataSetDesign );
			}
			session.defineDataSet( dataSetDesign );
			return dataSetDesign;
		}
		return null;
	}