Fix: Uncaught TypeError: Cannot read property '2' of undefined phaser.js...

...:63200

This is a bug which causes my tile level loading to fail unpredictably.
It only happens sometimes after importing a level from Tiled.

We need to continue to next loop iteration in the case where
map.tiles[tile.index] is undefined.

There was another line I just found which needs to make the same kind of check, see diff.