Add fnil around min to handle nil values for field

Author: transducer

Chapter04/Activity4.01/src/packt-clj/game_values.clj

@@ -77,4 +77,4 @@
   (->> users
        (filter #(= (:status %) status))
        (map field)
-       (apply min))) ;; do not use a default, (min '()) returns nil
+       (apply (fnil min 0 0))))