Do not display old food for juvenes

juvenes.py

         for weekday in range(1,7):
             url = "http://www.juvenes.fi/DesktopModules/Talents.LunchMenu/LunchMenuServices.asmx/GetMenuByWeekday?KitchenId={kitchen}&MenuTypeId={menutype}&Week={week}&Weekday={weekday}&lang='fi'&format=json".format(kitchen=kitchen, menutype=menutype, week=week, weekday=weekday)
             temp_fname = "juvenes_{count}-{weekday}.temp.js".format(count=count, weekday=weekday)
-            data = pnalib.get_jsonp_file(url, temp_fname, use_old)
+            data = pnalib.get_jsonp_file(url, temp_fname, use_old, allow_old=False)
             if data and data["d"] != "null":
                 data = json.loads(data["d"])
                 cur_day_foods = []

pnalib.py

 import urllib.error
 import json
 
-def get_jsonp_file(url, temp_fname, use_old):
-    return get_file(url, temp_fname, use_old, jsonp_load)
+def get_jsonp_file(url, temp_fname, use_old, allow_old=True):
+    return get_file(url, temp_fname, use_old, jsonp_load, allow_old)
 
-def get_json_file(url, temp_fname, use_old):
-    return get_file(url, temp_fname, use_old, json.load)
+def get_json_file(url, temp_fname, use_old, allow_old=True):
+    return get_file(url, temp_fname, use_old, json.load, allow_old)
 
 def jsonp_load(fp):
     return json.loads(fp.read()[1:-2])
 def read_all(fp):
     return fp.read()
 
-def get_file(url, temp_fname, use_old, consumer=read_all):
+def get_file(url, temp_fname, use_old, consumer=read_all, allow_old=True):
     if not use_old or not os.path.isfile(temp_fname):
         try:
             urllib.request.urlretrieve(url, temp_fname)
         except urllib.error.HTTPError as e:
             print("Failed to download {url}".format(url=url))
             # Juvenes may fail with error code 500 if food is not available
+            if not allow_old:
+                return None
     try:
         with open(temp_fname, "r", encoding="utf-8") as fin:
             return consumer(fin)