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
{
						ElementRefValue item = (ElementRefValue) valueList
								.get( i );
						if ( item.isResolved( ) )
						{
							try
							{
								
								
								PropertyCommand cmd = new PropertyCommand(
										module, element );
								cmd.removeItem( (ElementPropertyDefn) propDefn,
										item.getElement( ) );
							}
							catch ( SemanticException e )
							{
								assert false;
							}
						}
					}
				}
			}
		}
	}
	/**
	 * Deletes user properties. This will also remove property values from this
	 * element and derived elements.
	 * 
	 * @param obj
	 *            the element to clean up