System.IO.FileNotFoundException: File not found: ^maps/ra2/{DEV_VERSION}

[Mailaender]

https://travis-ci.org/OpenRA/ra2/builds/354734960#L1855 via OpenRA/ra2#393 (comment).

Testing ra2 mod MiniYAML...
Testing mod: Red Alert 2
OpenRA.Utility(1,1): Error: Failed with exception: System.IO.FileNotFoundException: File not found: ^maps/ra2/{DEV_VERSION}
File name: '^maps/ra2/{DEV_VERSION}'
  at OpenRA.FileSystem.FileSystem.Open (System.String filename) [0x00031] in /home/travis/build/OpenRA/ra2/engine/OpenRA.Game/FileSystem/FileSystem.cs:216 
  at OpenRA.FileSystem.FileSystem.OpenPackage (System.String filename) [0x00051] in /home/travis/build/OpenRA/ra2/engine/OpenRA.Game/FileSystem/FileSystem.cs:74 
  at OpenRA.Mods.Common.UtilityCommands.CheckYaml.OpenRA.IUtilityCommand.Run (OpenRA.Utility utility, System.String[] args) [0x001f3] in /home/travis/build/OpenRA/ra2/engine/OpenRA.Mods.Common/UtilityCommands/CheckYaml.cs:93 
make: *** [test] Error 1

Happens on OpenRA/ra2#393 after I move from 049ed08 to 5b16bb9. Can't reproduce it locally. It happens only on Travis.

[Mailaender]

Resolved by #14136.