Bug 142432 MasterPage from library can't be restored to modify
Details: MasterPage from library can't be restored to modify Step: 1.New a library named lib1, and insert a masterpage named lib-mp. 2.Publish the library into resource folder. 3.New a report design and use lib1. 4.Drop the lib-mp from library explorer into outline of report design. 5.Double click lib-mp, and switch to Property editro tab. 6.Click restore. Actual result: Pop up an error message and said that the master page cannot specify size the page type is not custom.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
* <code>null</code>.
	 * 
	 * @return a corresponding FontHandle or <code>null</code>.
	 * 
	 * @see FontHandle
	 */
	protected FontHandle getFontProperty( )
	{
		ElementPropertyDefn propDefn = getElement( ).getPropertyDefn(
				Style.FONT_FAMILY_PROP );
		if ( propDefn == null )
			return null;
		return new FontHandle( this );
	}
	/**
	 * Returns the value of an element reference property. Returns a handle to
	 * the referenced element, or <code>null</code> if the reference is
	 * unresolved or unset.
	 * 
	 * @param propName
	 *            the name of the property.
	 * @return a corresponding DesignElement handle to the referenced element
	 */
	public DesignElementHandle getElementProperty( String propName )
	{
		DesignElement target = getElement( ).getReferenceProperty( module,
				propName );
		if ( target == null )
			return null;
		return target.getHandle( target.getRoot( ) );