Ignore empty filename from content-disposition

e.g., the way google stores its user profile photos (from their oauth2 API)
https://lh3.googleusercontent.com/-aRHQV4YjnBM/AAAAAAAAAAI/AAAAAAAAAAo/ngSjy9-yR5c/photo.jpg

lib/paperclip/io_adapters/uri_adapter.rb

@@ -36,7 +36,7 @@ module Paperclip
     def filename_from_content_disposition
       if @content.meta.key?("content-disposition")
         matches = @content.meta["content-disposition"].match(/filename="([^"]*)"/)
-        matches[1] if matches
+        matches[1].presence if matches
       end
     end