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/core/Module.java
* @param module
	 *            the module information needed for the check, and records any
	 *            errors
	 */
	public final void semanticCheck( Module module )
	{
		allExceptions = validateWithContents( module );
		
		if ( module instanceof ReportDesign )
		{
			ContainerSlot slot = module
					.getSlot( ReportDesign.TEMPLATE_PARAMETER_DEFINITION_SLOT );
			assert slot != null;
			for ( int i = slot.getCount( ) - 1; i >= 0; i-- )
			{
				TemplateParameterDefinition templateParam = (TemplateParameterDefinition) slot
						.getContent( i );
				if ( templateParam.getClientList( ).isEmpty( ) )
				{
					slot.remove( templateParam );
					
					
					module.manageId( templateParam, false );
					
					templateParam.setContainer( null, DesignElement.NO_SLOT );
				}
			}
		}
		
		this.nameManager.clear( );