Bug 173236 NPE is thrown when opening a design file that is created by a higher version BIRT
1. New a report, switch to xml-source view. 2. Edit the version number in line 2, from 3.2.10 to 3.2.11 and save. 3. Close the report and reopen it. The xml-source view is opened automatically. Switch to lay-out view, there's an error message window, and NPE is thrown in error-log view. When user is trying to open a design file that is created by a higher version BIRT, model will throw an exception and stop parsing the report design file. UI should 1. Prevent the NPE 2. Telling user that he is using a higher version design file that this build does not support. (Catch the exception and reflect the message in the exception to end user)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ErrorDetail.java
{
		type = DesignFileException.DESIGN_EXCEPTION_INVALID_XML;
		exceptionName = e.getClass( ).getName( );
		message = e.getMessage( );
		description.append( " ( line = " ); 
		description.append( e.getLineNumber( ) );
		description.append( ") " ); 
		description.append( e.getClass( ).getName( ) );
		description.append( " (" ); 
		description.append( "message : " ); 
		description.append( e.getMessage( ) );
		description.append( ")" ); 
		lineNo = e.getLineNumber( );
		if ( e.getCause( ) != null && e.getCause( ) instanceof RuntimeException )
		{
			translateRuntimeException( (RuntimeException) e.getCause( ) );
		}
	}
	/**
	 * Translates <code>SAXException</code>.
	 * 
	 * @param e
	 *            a SAX exception to translate
	 */
	private void translate( SAXException e )
	{
		type = DesignFileException.DESIGN_EXCEPTION_INVALID_XML;
		exceptionName = e.getClass( ).getName( );
		message = e.getMessage( );
		description.append( " " );