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
* must be <code>ReportDesign</code> or <code>Library</code>.
	 * 
	 * @return the module on which this handle is attached.
	 */
	public Module getModule( )
	{
		return module;
	}
	/**
	 * Returns the handle of report design only when the module is report
	 * design. Otherwise, null is returned.
	 * 
	 * @return the handle of report design, or null if the module is not report
	 *         design.
	 * @deprecated replaced by getModuleHandle()
	 */
	public ReportDesignHandle getDesignHandle( )
	{
		if ( getDesign( ) != null )
			return (ReportDesignHandle) getDesign( ).getHandle( module );
		return null;
	}
	/**
	 * Returns the handle of module. The returned module must be
	 * <code>ReportDesignHandle</code> or <code>LibraryHandle</code>.
	 * 
	 * @return the handle of module
	 */
	public ModuleHandle getModuleHandle( )
	{