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
* 
	 * @return a list containing all the include scripts. Return
	 *         <code>null</code> if there were no scripts defined.
	 */
	public List getIncludeScripts( )
	{
		return (ArrayList) getLocalProperty( this, INCLUDE_SCRIPTS_PROP );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.DesignElement#getIntrinsicProperty(java.lang.String)
	 */
	protected Object getIntrinsicProperty( String propName )
	{
		if ( UNITS_PROP.equals( propName ) )
		{
			return units;
		}
		else if ( THEME_PROP.equals( propName ) )
		{
			return theme;
		}
		return super.getIntrinsicProperty( propName );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.DesignElement#setIntrinsicProperty(java.lang.String,
	 *      java.lang.Object)