minor bugfix when None value passed to function

__init__.py

@@ -99,6 +99,8 @@ def calendarCredentials(token = None):
     
 def updateCalendars(user, calendars, colors):
     
+    if user == None or calendars == None or colors == None:
+        return
     COLORS_FILE = os.path.join(os.path.dirname(__file__), 'colors.json')
     with open(COLORS_FILE) as f:
         colormap = json.load(f)