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 canExecute = true;
				if ( dataSet instanceof OdaDataSetHandle )
				{
					String queryTxt = ( (OdaDataSetHandle) dataSet ).getQueryText( );
					canExecute = ( queryTxt != null && queryTxt.trim( )
							.length( ) > 0 );
				}
				if ( canExecute )
				{
					IQueryResults results = execute( dataSet,
							useColumnHints,
							true,
							1 );
					if ( results != null )
					{
						results.close( );
					}
					
					columns = (DataSetViewData[]) htColumns.get( dataSet );
				}
			}
			catch ( BirtException e )
			{
				if ( !suppressErrorMessage )
				{
					ExceptionHandler.handle( e );
				}
			}
		}