Changing costume to one with zero width or height doesn't update correctly

[cwillisf]

Expected Behavior

When the user clicks a costume in the paint editor, the sprite's bounds should always be updated to match the costume.

Actual Behavior

When the user clicks a costume in the paint editor, the sprite's bounds are updated to match the costume ONLY if the new costume's width and height are both non-zero.

Steps to Reproduce

1. Create or edit a project which uses the pen extension
2. Make a sprite with at least two costumes:
   • One with a perfectly vertical or horizontal line, which due to Vector vertical and horizontal line costumes not showing on stage #434 will get a 1x1 ImageData object internally.
   • One "normal" costume where width and height are both non-zero
3. Move the rotation center outside the costume for the "normal" costume
4. Activate the "normal" costume and use pen down and go to random position to see fencing behavior
5. While the project is running, switch to the other costume.

Expected: the sprite (Drawable) is fenced according to the new 1x1 ImageData
Actual: the sprite (Drawable) is fenced according to the previous "good" costume

The problem goes away after using the paint editor to adjust the rotation center of the zero-width / zero-height costume.

Example (thanks @fsih!)

[adroitwhiz]

I think this was fixed by scratchfoundation/scratch-vm#2314.