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
public void setExtendsName( String name ) throws ExtendsException
	{
		DesignElement element = getElement( );
		ExtendsCommand cmd = new ExtendsCommand( module, element );
		cmd.setExtendsName( name );
	}
	/**
	 * Localize the element, break the parent/child relationship and set all the
	 * extended properties locally.
	 * 
	 * @throws SemanticException
	 *             the element can not be localized properly. It may be because
	 *             that the element is not extended from a parent, or that same
	 *             properties can not be localized on the element or the content
	 *             elements inside it.
	 */
	public void localize( ) throws SemanticException
	{
		DesignElement element = getElement( );
		ExtendsCommand cmd = new ExtendsCommand( module, element );
		cmd.localizeElement( );
	}
	/**
	 * Sets this element to extend the given element.
	 * 
	 * @param parent
	 *            the element that this element is to extend
	 * @throws ExtendsException
	 *             If the parent element is of the wrong type as this element.
	 *