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
{
						if ( isTableOrView( temp.getType( ) ) )
							continue;
						else
						{
							return false;
						}
					}
					else if ( temp.getType( ) == type )
					{
						continue;
					}
					else
					{
						return false;
					}
				}
				return true;
			}
			/**
			 * 
			 * @param type
			 * @return
			 */
			private boolean isAcceptableDbObjectType( int type )
			{
				if ( type == DbObject.ROOT_NODE_TYPE
						|| type == DbObject.PROCEDURE_TYPE )
				{
					return false;