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
+ "'/>\n" ).getBytes( ) );
			pptOutput.write( ( "</v:shape>\n" ).getBytes( ) ); 			
		}
		catch ( IOException ioe )
		{
			logger.log( Level.WARNING, ioe.getMessage( ), ioe );
		}
	}
	private String getImageExtension( String imageURI )
	{
		String rectifiedImageURI = imageURI.replace( '.', '&' );
		String extension = imageURI.substring( rectifiedImageURI.lastIndexOf( '&' ) + 1 )
				.toLowerCase( );
		if ( extension.equals( "svg" ) )
		{
			extension = "jpg";
		}
		return extension;
	}
	/*
	 * Save the image name into file list of current page
	 */
	private void recordFileLists( String filename )
	{
		Integer pageNum = new Integer( currentPageNum );
		if ( fileNamesLists.containsKey( pageNum ) )
		{
			( (List) fileNamesLists.get( pageNum ) ).add( filename );
		}
		else