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 ( !( selection[i].getData( ) instanceof Procedure ) )
							{
								event.doit = false;
								return;
							}
						}
					}
					else if ( selection[0].getData( ) instanceof ProcedureParameter )
					{
						event.doit = false;
						return;
					}
					else if ( selection[0].getData( ) instanceof String )
					{
						for ( int i = 0; i < selection.length - 1; i++ )
						{
							if ( !( selection[i + 1].getData( ) instanceof String ) )
							{
								event.doit = false;
								return;
							}
						}
					}
				}
				else if ( selection.length <= 0
						|| selection[0].getData( ) == null )
				{
					event.doit = false;
					return;
				}