Bug 153405 Null parameter value is inconsistent between designer and preview
Description: Null parameter value is inconsistent between designer and preview Steps to reproduce: 1. New a report parameter, list-box, tick AllowNull. 2. Click New button, click OK without input anything. 3. Drag the parameter to Layout and preview Actual result: After step2, display text is "Null" and value is empty. However, when preview, the display text is "Null Value". Expected result: Display text and value should be consistent between Edit Parameter Dialog in Layout and Parameter dialog during preview.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
else
			{
				inputParameter.setProperty( ScalarParameterHandle.FIXED_ORDER_PROP,
						null );
			}
			
			if ( !isStatic( ) && !StringUtil.isBlank( listLimit.getText( ) ) )
			{
				try
				{
					inputParameter.setListlimit( Integer.parseInt( listLimit.getText( ) ) );
				}
				catch ( NumberFormatException ex )
				{
					ExceptionHandler.openErrorMessageBox( ERROR_TITLE_INVALID_LIST_LIMIT,
							MessageFormat.format( ERROR_MSG_INVALID_LIST_LIMIT,
									new Object[]{
										Integer.toString( Integer.MAX_VALUE )
									} ) );
				}
			}
			else
			{
				inputParameter.setProperty( ScalarParameterHandle.LIST_LIMIT_PROP,
						null );
			}
		}
		catch ( Exception e )
		{
			ExceptionHandler.handle( e );