def method_missing(method, *args)
      super unless args.empty?
      super unless methods.include?(method)
      @exif.send method if defined?(@exif) && @exif
    end
def method_missing(method, *args)
      super unless args.empty?
      super unless methods.include?(method)
      @exif.send method if defined?(@exif) && @exif
    end
Dispatch to EXIF.  When no EXIF data is available but the
 +method+ does exist for EXIF data +nil+ will be returned.