Could you have MC generate an ID for movies that are not in IMDB? This way the wall and html movie card export will work correctly. Currently, if there is no ID, then an image is saved without a name (".jpg") and that is the image that is used for all movies without an ID.
To work around this I have just manually edited the nfo files to include an ID (I usually just give it the movie name without spaces), but just thought I would throw this feature request out anyways.
Thanks for all your hard work.