Bug 146481 Name is not necessary for extended element
Steps to reproduce: 1.New a label named "label" in library 2.New a report, extend lib.label Expected result: No name for the extended label Actual result: "label" is added as the name of label in report. It's not reasonable because "Restore Properties" is enabled even without properties change.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/EmptyGroupElementHandle.java
* 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#getModule()
	 */
	public Module getModule( )
	{
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#getModuleHandle()
	 */
	public ModuleHandle getModuleHandle( )
	{
		return null;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isSameType()
	 */
	
	public boolean isSameType( )
	{
		return false;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#getCommonProperties()
	 */
	
	public List getCommonProperties( )
	{