anchor.diff:                  {ok, Filename} ->
                       {url, Url, _TagOptions, _ImageOptions} = url1(Filename, Options, Context),
                       {ok, Url};
  -                _ -> {ok, []}
  +                _ -> {ok, <<>>}
               end
       end;
   url([{_Prop, _Value}|_] = Props, Options, Context) ->
  
positive.code:     {ok, Url}.
      
  
  %% @spec url1(Filename, Options, Context) -> {url, Url, TagOptions, ImageOpts} | {error, Reason}
  %% @doc Creates an url for the given filename and filters.  This does not check the filename or if it is convertible.
  url1(Filename, Options, Context) ->
      {TagOpts, ImageOpts} = lists:partition(fun is_tagopt/1, Options),
  
negative.code:     filename:join("/image/", Filename).
  
  
  %% @spec url(MediaRef, Options, Context) -> {ok, Url::binary()} | {error, Reason}
  %% @doc Generate the url for the image with the filename and options
  url(undefined, _Options, _Context) ->
      {error, enoent};
  