Create our own anonymous user class

This is required so the anonymous user also has a time zone (which is required to render public events.)

calsocial/security.py

@@ -17,6 +17,18 @@
 """Security related things for Calendar.social
 """
 
-from flask_security import Security
+from flask_security import Security, AnonymousUser as BaseAnonymousUser
 
 security = Security()
+
+
+class AnonymousUser(BaseAnonymousUser):
+    """Anonymous user class for Calendar.social
+    """
+
+    @property
+    def timezone(self):
+        """The time zone of the anonymous user
+        """
+
+        return None