[Technical feedback/suggestion] Fallback sprites for updated character builds

[-Variant]

This is a suggestion on a more technical scale that most people won't see/be bothered by, but I've come to suggest the use of fallback sprites when the devs/artist add more sprites/animations with new sprites attached.

The chairs for example brought face sprites 40 and 41. Meaning every existing modded character build will be required to update their builds to add these sprites.

The idea is that whilst these sprites don't exist, they fall back to using 4-7, the usual side view sprites.
This will mean that mods without the required sprites will have a blank stare while talking, it beats the alternative of the face entirely vanishing, like so:

Additionally, it'd be friendlier to mods that have since been deprecated, and/or don't have artists around to update them, keeping them from somewhat falling behind, to a degree.