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[#1418] Fix freeze when actor width or height is 0 and tilemap is shown (#1491)

Closes #1418 

TileMapImpl.collides() got stuck infinitely on the `trace points for overlap` loop when the actor's size is zero.

## Changes:

- Check size of actor before deciding whether to run the collision logic
- Return null when actor width or height is 0

Co-authored-by: Vincent Beers <vincent.beers@sogeti.com>

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