Fix str_contains passing null when expected str

src/util.phel

@@ -6,7 +6,7 @@
   (println x)(php/die))
 
 (defn get-from-list [xs key default & [split]]
-  (let [arg (find |(php/str_contains $ key) xs)]
+  (let [arg (find |(php/str_contains (or $ "") key) xs)]
     (if (empty? arg)
       default
       (php/intval (get (php/explode (or split "=") arg) 1)))))