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 theSession
	 *            the session of the report
	 */
	protected Module( DesignSession theSession )
	{
		session = theSession;
		for ( int i = 0; i < NAME_SPACE_COUNT; i++ )
		{
			nameSpaces[i] = new NameSpace( );
			moduleNameSpaces[i] = ModuleNameScopeFactory
					.createElementNameSpace( this, i );
		}
		
		setID( getNextID( ) );
		addElementID( this );
		
		nameManager = new NameManager( this );
		versionMgr = new VersionControlMgr( );
	}
	/**
	 * Returns the design session that represents the designs that the user has
	 * open and user preferences.
	 * 
	 * @return the design session
	 */
	public DesignSession getSession( )
	{
		return session;
	}
	/**