am 1976dd91: am 71f6426a: Merge "Add nullness check." into jb-mr2-dev

     * Reads Exif tags from the specified JPEG file.

     */

    public ExifInterface(String filename) throws IOException {

        if (filename == null) {

            throw new IllegalArgumentException("filename cannot be null");

        }

        mFilename = filename;

        loadAttributes();

    }