* Fix an uncatched exceptions when a tile map resource is not set.
* Show place-holders for tile map with invalid resources in the instances editor.
* Give a better default name to tile map collision mask objects.
* Add a border around the tile map collision mask objects in the instance editor.
* It makes the same boxes as the tilemaps collision mask object to ease positioning.
* If the extra margin is not intended the right size can be set with Tiled.
* The collision mask is read from the tile maps exported by Tiled 1.9+.
* Several collision masks can be used for instance to have platforms and ladders.
* Take a look to the wiki for more details https://wiki.gdevelop.io/gdevelop5/objects/tilemap
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