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
}
	/**
	 * Preprares to save this module. Sets the modification date.
	 */
	public void prepareToSave( )
	{
	}
	/**
	 * Records a successful save.
	 */
	public void onSave( )
	{
		saveState = activityStack.getCurrentTransNo( );
		nameManager.clear( );
	}
	/**
	 * Reports whether the module has changed since it was created, loaded from
	 * disk, or saved, whichever has occurred most recently.
	 * 
	 * @return true if the in-memory version of the module differs from that on
	 *         disk, false if the two representations are the same
	 */
	public boolean isDirty( )
	{
		return saveState != activityStack.getCurrentTransNo( );
	}
	/**
	 * Called when creating a new module.
	 */
	protected void onCreate( )