Commits on Jul 7, 2024

1. [1862/autorouter] Fix freight trains not being able to auto route …

   A minimal repro is here: https://gist.github.com/PistonPercy/dbbad162540451e8941dfae3e57ccbc9
   
   ```
   Uncaught []: undefined method `[]' for nil
   Caused by: Object { … }
   klass runtime.js:589
   $Exception_new$1 error.rb:12
   $$method_missing basic_object.rb:146
   method_missing_stub runtime.js:1563
   $$adjust_end game.rb:1618
   $$hex_crow_distance game.rb:1631
   $$freight_revenue game.rb:1671
   $$revenue_for game.rb:1676
   ```
   
   which is originating from this line: https://github.com/tobymao/18xx/blob/master/lib/engine/game/g_1862/game.rb#L1618
   
   The issue is the chains from the auto router don't have :hexes, but this code
   expects there to be. I'm not sure if :hexes is suppose to be there or the other
   side should be tweaked.

   

   PistonPercy committed Jul 7, 2024
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