Bug 193886 NPE is thrown when preview external CSS style in ppt[1205]
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
*            the emitter svervices object.
	 */
	public void initialize( IEmitterServices services )
	{
		this.services = services;
		this.reportRunnable = services.getReportRunnable( );
		if ( reportRunnable != null )
		{
			reportDesign = (ReportDesignHandle) reportRunnable.getDesignHandle( );
		}
		this.context = services.getReportContext( );
		Object fd = services.getOption( RenderOption.OUTPUT_FILE_NAME );
		File file = null;
		try
		{
			if ( fd != null )
			{
				file = new File( fd.toString( ) );
				File parent = file.getParentFile( );
				if ( parent != null && !parent.exists( ) )
				{
					parent.mkdirs( );
				}
				pptOutput = new FileOutputStream( file );
			}
		}
		catch ( FileNotFoundException fnfe )
		{
			logger.log( Level.WARNING, fnfe.getMessage( ), fnfe );
		}