Bug 145520 Group name will not show up in group list if the group use default name and key expression has no value
Description: Group name will not show up in group list if key expression has no value. Steps to reproduce: 1. Insert a table into report, bind it to a data set 2. Switch to property editor -> groups 3. Click on add button to open new group dialog, then press ok button Expected result: A new group with default name will be added to group list Actual result: A new group is added to group list, but without group name. But when let group tab lost focus and get focus again, you can see the group name.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
ContentException.DESIGN_EXCEPTION_CONTENT_NAME_REQUIRED );
		}
		
		ContainerSlot slot = element.getSlot( slotID );
		if ( !slot.contains( oldElement ) )
			throw new ContentException( element, slotID, oldElement,
					ContentException.DESIGN_EXCEPTION_CONTENT_NOT_FOUND );
		
		if ( oldElement instanceof TemplateElement )
		{
			if ( !oldElement.canDrop( )
					|| !oldElement.isTemplateParameterValue( module )
					|| !newElement.getDefn( ).isKindOf(
							( (TemplateElement) oldElement ).getDefaultElement(
									module ).getDefn( ) ) )
				throw new TemplateException(
						oldElement,
						TemplateException.DESIGN_EXCEPTION_REVERT_TO_TEMPLATE_FORBIDDEN );
		}
		else
		{
			if ( !oldElement.canTransformToTemplate( module )
					|| !( newElement instanceof TemplateElement ) )
				throw new ContentException(
						element,
						slotID,
						ContentException.DESIGN_EXCEPTION_TEMPLATE_TRANSFORM_FORBIDDEN );
		}