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
}
				return true;
			}
			/**
			 * 
			 * @param type
			 * @return
			 */
			private boolean isTableOrView( int type )
			{
				if ( type != DbObject.TABLE_TYPE && type != DbObject.VIEW_TYPE )
				{
					return false;
				}
				return true;
			}
			/*
			 * (non-Javadoc)
			 * @see org.eclipse.swt.dnd.DragSourceAdapter#dragSetData(org.eclipse.swt.dnd.DragSourceEvent)
			 */
			public void dragSetData( DragSourceEvent event )
			{
				if ( TextTransfer.getInstance( )
						.isSupportedType( event.dataType ) )
				{
					populateEventData( event );
				}
			}
		} );
	}