Exit gracefully when dataDir is missing
Right now we don't really check that the data files are where we expect them to be before trying to load them, so the game would e.g. crash when trying to load the Run
animation file.
The simplest workaround would be to check for the existence of the dataDir
folder in the game's init - a more involved solution would be to gracefully handle any missing file access, though it might have some more performance cost?