Work on person, user, contact, address improvements

app/routers/person.py

@@ -398,6 +398,7 @@ async def lookup_email(
 
     # time.sleep(1)
 
+    # Updated 2021-12-13
     if person_rec_list_result := get_person_rec_list(
             #account_id = account_id,
             for_obj_type = 'account',
@@ -424,7 +425,7 @@ async def lookup_email(
             else:
                 person_result_list.append(None)
         response_data = person_result_list
-    elif person_rec_list_result is None:
+    elif isinstance(person_rec_list_result, list) or person_rec_list_result is None: # Empty list or None
         log.info('No results')
         return mk_resp(data=None, status_code=404, response=response) # Not Found
     else: