path is never nil

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -1567,7 +1567,7 @@ def process_path(options, controller, path, option_path)
         def using_match_shorthand?(path, to, action)
           return false if to || action
 
-          path && path =~ %r{^/?[-\w]+/[-\w/]+$}
+          path =~ %r{^/?[-\w]+/[-\w/]+$}
         end
 
         def decomposed_match(path, controller, options, _path) # :nodoc: