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
static
	{
		try
		{
			ImageRegistry reg = JFaceResources.getImageRegistry( );
			reg.put( TABLE_ICON,
					ImageDescriptor.createFromFile( JdbcPlugin.class,
							"icons/table.gif" ) );
			reg.put( VIEW_ICON,
					ImageDescriptor.createFromFile( JdbcPlugin.class,
							"icons/view.gif" ) );
			reg.put( PAGE_ICON,
					ImageDescriptor.createFromFile( JdbcPlugin.class,
							"icons/create_join_wizard.gif" ) );
			reg.put( SCHEMA_ICON,
					ImageDescriptor.createFromFile( JdbcPlugin.class,
							"icons/schema.gif" ) );
			reg.put( DATABASE_ICON,
					ImageDescriptor.createFromFile( JdbcPlugin.class,
							"icons/data_source.gif" ) );
			reg.put( COLUMN_ICON,
					ImageDescriptor.createFromFile( JdbcPlugin.class,
							"icons/column.gif" ) );
		}
		catch ( Exception ex )
		{
		}
	}
	/**
	 * constructor