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
TemplateException.DESIGN_EXCEPTION_CREATE_TEMPLATE_ELEMENT_FORBIDDEN );
		TemplateCommand cmd = new TemplateCommand( getModule( ), getContainer( )
				.getElement( ) );
		TemplateElement template = cmd.revertToTemplate( getElement( ),
				getElement( ).getContainerSlot( ), name );
		if ( template == null )
			return null;
		return (TemplateElementHandle) template.getHandle( module );
	}
	/**
	 * if this design element is based on a template definition
	 * {@link #isTemplateParameterValue( )},get rid of the template definition )
	 * 
	 * @throws SemanticException
	 */
	public void revertToReportItem( ) throws SemanticException
	{
		clearProperty( REF_TEMPLATE_PARAMETER_PROP );
	}
	/**
	 * Checks whether this element is based on a template parameter definition
	 * or not. Call this method before calling method
	 * {@link #revertToTemplate(String) }to assure that this element can be
	 * reverted to a template element. If this method returns false, method
	 * <code>revertToTemplate(String)</code> must fail too.
	 * 
	 * @return true if this element is based on a template parameter definition,
	 *         otherwise false
	 */
	public boolean isTemplateParameterValue( )