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
* Justifies whether this element has any semantic error or not.
	 * 
	 * @return true if the element has any semantic error, otherwise false
	 */
	public boolean hasSemanticError( )
	{
		return !getSemanticErrors( ).isEmpty( );
	}
	/**
	 * Deeply clones the current design element which is wrapped by the handle.
	 * 
	 * @return the copy of the design element
	 */
	public IDesignElement copy( )
	{
		try
		{
			return (DesignElement) getElement( ).clone( );
		}
		catch ( CloneNotSupportedException e )
		{
			assert false;
		}
		return null;
	}
	/**
	 * Copies all properties to the target element. The following properties
	 * will not be copied.
	 * <ul>
	 * <li><code>DesignElement.NAME_PROP</code>