Bug 153523 OK button in parameter dialog is enabled without default value in combo-box
Description: OK button in parameter dialog is enabled without default value in combo-box Steps to reproduce: 1. New a report parameter, combo-box. 2. Click New button, input abc as value, click OK 3. Set abc as default value and close Edit Parameter dialog. 4. New a data source and dataset 5. Edit the parameter, remove abc value and import values from dataset Expected result: OK button is disabled for there is no default value. Actual result: OK button is enabled.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			elementsList.add( newParameter );
			return elementsList.toArray( );
		}
		public void dispose( )
		{
		}
		public void inputChanged( Viewer viewer, Object oldInput,
				Object newInput )
		{
		}
	};
	private ITableLabelProvider labelProvider = new ITableLabelProvider( ) {
		public Image getColumnImage( Object element, int columnIndex )
		{
			return null;
		}
		public String getColumnText( Object element, int columnIndex )
		{
			String value = null;
			ScalarParameterHandle paramHandle = null;
			if ( element instanceof ScalarParameterHandle )
			{
				paramHandle = (ScalarParameterHandle) element;
			}