Bug 124620 Referenced Parameter icon should be invalid if the parameter in library is deleted
Description: Referenced parameter icon should be invalid if the source parameter in library is deleted. Steps to reproduce: 1.Create a library. Insert a report scalar parameter. 2.Create a report, use the above library. In the library explorer, pull the parameter to the data explorer view of report. 3.Open the library file, delete the parameter. Then reopen the report design file, the icon of parameter seems nothing happened. But if those operations happened in dataset, the icon of dataset in the report will be invalid. It is acceptable. Expected Result: The icon of referenced parameter should be invalid.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
}
	/**
	 * Returns the unique ID for this object. The ID is valid only within this
	 * one design session. IDs are available only if the application is
	 * configured to use IDs. In general, the web client requires IDs, but the
	 * Eclipse client does not.
	 * 
	 * @return the element ID
	 * @see ModuleHandle#getElementByID
	 * @see org.eclipse.birt.report.model.metadata.MetaDataDictionary#enableElementID
	 */
	public long getID( )
	{
		return getElement( ).getID( );
	}
	/**
	 * Returns the element factory for creating new report elements. After
	 * creating the element, add it to the design by calling the the
	 * <code>{@link SlotHandle#add( DesignElementHandle ) add}</code> method
	 * of the slot handle that represents the point in the design where the new
	 * element should appear.
	 * 
	 * @return a handle to the new element.
	 * @see SlotHandle
	 */
	public ElementFactory getElementFactory( )
	{
		return new ElementFactory( module );
	}
	/**