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/provider/JdbcMetaDataProvider.java
/**
 	 * Get procedure's columns information
 	 */
 	public ArrayList getProcedureColumns(String cataLog,
			  String schemaPattern,
			  String procedureNamePattern, 
			  String columnNamePattern)
	{
 		ArrayList columnList = new ArrayList();
 		if ( metaData == null )
		{
			metaData = getMetaData( );
		}
 		
		ResultSet columnsRs = null;
		if ( cataLog != null && cataLog.trim( ).length( ) == 0 )
		{
			cataLog = null;
		}
		if ( metaData != null )
		{
			try
			{
				try
				{
					columnsRs = metaData.getProcedureColumns( cataLog,
							schemaPattern,
							procedureNamePattern,
							columnNamePattern );
				}