Bug 142675 [Regression]Query change is not saved without "Preview Results"
Steps to reproduce: 1.New a sample data source and a data set with table "CUSTOMERS" 2.Edit the data set, change table to "ORDERS", click "OK" Expected result: Query text is changed Actual result: Changed query is not saved unless click "Preview Results" before click "OK"
model/org.eclipse.birt.report.model.adapter.oda/src/org/eclipse/birt/report/model/adapter/oda/ModelOdaAdapter.java
{
		assert propHandle != null;
		propHandle.setValue( null );
		if ( structList == null || structList.isEmpty( ) )
			return;
		for ( int i = 0; i < structList.size( ); i++ )
			propHandle.addItem( structList.get( i ) );
	}
	/**
	 * Updates a strucutre list with the corresponding property handle.
	 * 
	 * @param propHandle
	 *            the property handle
	 * @param structList
	 *            the structure list
	 * @throws SemanticException
	 *             if any strucutre has invalid value.
	 */
	private void updateROMDataSetParamList( OdaDataSetHandle setHandle,
			List structList ) throws SemanticException
	{
		setHandle.setProperty( OdaDataSetHandle.PARAMETERS_PROP, null );
		if ( structList == null || structList.isEmpty( ) )
			return;
		PropertyHandle propHandle = setHandle
				.getPropertyHandle( OdaDataSetHandle.PARAMETERS_PROP );
		for ( int i = 0; i < structList.size( ); i++ )
			propHandle.addItem( structList.get( i ) );
	}
	/**