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
/**
	 * @param dataSet
	 * @param dataSetDesign
	 * @throws BirtException
	 */
	private void defineSourceDataSets( DataSetHandle dataSet,
			IBaseDataSetDesign dataSetDesign ) throws BirtException
	{
		List dataSets = dataSet.getModuleHandle( ).getAllDataSets( );
		for ( int i = 0; i < dataSets.size( ); i++ )
		{
			DataSetHandle dsHandle = (DataSetHandle) dataSets.get( i );
			if ( dsHandle.getName( ) != null )
			{
				if ( dsHandle.getName( )
						.equals( ( (IJointDataSetDesign) dataSetDesign ).getLeftDataSetDesignName( ) )
						|| dsHandle.getName( )
								.equals( ( (IJointDataSetDesign) dataSetDesign ).getRightDataSetDesignName( ) ) )
				{
					getDataSetDesign( dsHandle, true, true );
				}
			}
		}
	}
	/**
	 * 
	 * @param dataSet
	 * @return
	 * @throws BirtException