Suggested by @rodrigok.

Looks much better on small images to be aligned in the center.  Especially if height needs to remain at 200px;

This way area doesn't expand after the image loads causing content to shift.

By setting height to 200 you were causing images to stretch.  Setting it to a max-height, makes it fit auto resize to fit your max height.

rocketchat_embed_cache. Handle error where oembed_cache doesn't exist.