Image attachment to comments.app widget is broken. Image is not attached to comment upon upload ends, server returns "Server error".
Steps to reproduce
On a website that has Discussbot (comments.app) comments widget enabled, login, press on the "Attach a file" button, select image file (jpg, gif or png) and upload it.
Current result:
Image uploaded (HTTP status 200 returned on upload POST request), but server returns "Server error" JSON response. Image is not attached to comment body.
It does not matter which image size or format is used.
Expected result:
Image attached to comment body upon upload completed.
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