Add a shortcut that will return the thumbnail or the original file

[liliserf]

I'm currently using get_thumbnail to upload an image and then immediate fetch it on a subsequent request. As it's well known, generating that thumbnail is a slow process, so it holds up the following request because it has not been generated/cached yet.

Would it be possible to add a shortcut that will check for a thumbnail and return it if it exists in the cache, and if not, that will just return the original file, rather coupling the actions of checking for a thumbnail and returning it in a single call?