Bug 199021 Error message pops up several times when click an invalid dataset
Description: There is a sqlserver datasource and dataset, remove the jtds driver to let the dataset invalid. Double click on the dataset, the error message will pop up serveral times. Build version:2.2.0.v20070807-0630 Steps to reproduce: 1. Create a sqlserver datasource and dataset. 2. Remove the jtds driver, and the dataset will be invalid. 3. Double click on the dataset. Expect result: Error message pops up once to indicate the problem. Actual result: Error message pops up serveral times.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
*/
	private void setFilterComboContents( ComboViewer filterComboViewer )
	{
		if ( filterComboViewer == null )
		{
			return;
		}
		ArrayList dbTypeList = new ArrayList( );
		DbType tableType = new DbType( DbType.TABLE_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.tabletype" ) );
		DbType viewType = new DbType( DbType.VIEW_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.viewtype" ) );
		DbType allType = new DbType( DbType.ALL_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.All" ) );
		DbType procedureType = new DbType( DbType.PROCEDURE_TYPE,
				JdbcPlugin.getResourceString( "tablepage.text.procedure" ) );
		
		dbTypeList.add( allType );
		dbTypeList.add( tableType );
		dbTypeList.add( viewType );
		if ( metaDataProvider.isProcedureSupported( ) )
			dbTypeList.add( procedureType );
		filterComboViewer.setContentProvider( new IStructuredContentProvider( ) {
			public Object[] getElements( Object inputElement )
			{
				if ( inputElement != null )
				{
					return ( (ArrayList) inputElement ).toArray( );
				}
				return new DbType[]{};