Sprites smaller than 5x5 get an error but seem to work OK

[david-pfx]

I just found that sprites smaller than 5x5 get the error message: Sprite graphics must be 5 wide and 5 high exactly, but seem to work perfectly. Why not just allow them?

Repro object:

s3
black red blue
012
201
120

[increpare]

I decided that 5x5 was an aesthetic sweet spot for making things easy/quick to edit while still having readability.