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
Object value = element.getLocalProperty( module,
						(ElementPropertyDefn) propDefn );
				if ( value != null )
				{
					if ( ( value instanceof StructRefValue )
							|| ( (ElementRefValue) value ).isResolved( ) )
					{
						try
						{
							
							
							PropertyCommand cmd = new PropertyCommand( module,
									element );
							cmd.setProperty( propDefn.getName( ), null );
						}
						catch ( SemanticException e )
						{
							assert false;
						}
					}
				}
			}
			else if ( propDefn.getTypeCode( ) == PropertyType.LIST_TYPE
					&& propDefn.getSubTypeCode( ) == PropertyType.ELEMENT_REF_TYPE )
			{
				List valueList = (List) element.getLocalProperty( module,
						(ElementPropertyDefn) propDefn );
				if ( valueList != null )
				{
					for ( int i = valueList.size( ) - 1; i >= 0; i-- )