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
* @return the qualified name of thie element.
	 */
	public String getQualifiedName( )
	{
		String name = getName();
	
		if ( name == null )
			return null;
		Module rootElement = getElement( ).getRoot( );
		if ( rootElement instanceof Library )
		{
			String namespace = ( (Library) rootElement ).getNamespace( );
			return StringUtil.buildQualifiedReference( namespace, name );
		}
		return name;
	}
	/**
	 * Sets the name of this element. If the name is <code>null</code>, then
	 * the name is cleared if this element does not require a name.
	 * 
	 * @param name
	 *            the new name
	 * @throws NameException
	 *             if the name is duplicate, or if the name is <code>null</code>
	 *             and this element requires a name.
	 */
	public void setName( String name ) throws NameException
	{
		NameCommand cmd = new NameCommand( module, getElement( ) );
		cmd.setName( name );