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
{
			try {
				if( !jdbcConnection.isClosed())
				{
					jdbcConnection.close();
				}
			} catch (SQLException e) {
				logger.log( Level.FINE, e.getMessage( ), e );
			}
		}
	}
    
	/*
	 *  (non-Javadoc)
	 * @see org.eclipse.birt.report.data.oda.jdbc.ui.provider.IMetadataProvider#getDataBaseName()
	 */
    public String getDataBaseName()
    {
    	if( jdbcConnection == null)
    	{
    		return "";
    	}
    	
    	if ( metaData == null)
      	{
      		try
			{
      			metaData = jdbcConnection.getMetaData();
			}
      		catch ( SQLException e )