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 bindingParams
	 * @return
	 */
	public final QueryDefinition getQueryDefinition(
			IBaseDataSetDesign dataSetDesign, ParamBindingHandle[] bindingParams )
	{
		return getQueryDefinition( dataSetDesign, bindingParams, -1 );
	}
	
	/**
	 * @param dataSetDesign
	 * @param bindingParams
	 * @param i
	 * @return
	 */
	private QueryDefinition getQueryDefinition(
			IBaseDataSetDesign dataSetDesign,
			ParamBindingHandle[] bindingParams, int rowsToReturn )
	{
		if ( bindingParams == null || bindingParams.length == 0 )
		{
			return getQueryDefinition( dataSetDesign, rowsToReturn );
		}
		if ( dataSetDesign != null )
		{
			QueryDefinition defn = new QueryDefinition( null );
			defn.setDataSetName( dataSetDesign.getName( ) );
			if ( rowsToReturn > 0 )
			{
				defn.setMaxRows( rowsToReturn );