Update terminology, add username check for later users

read_mattermost.py

@@ -78,12 +78,10 @@ channel = channel_data["id"]
 ##################################
 # Get users
 
-# People who are authorized to grant pancakes
+# People who are authorized to do verifications
 tagger_ids = {u["id"]: u["username"] for u in mm.get_users_by_usernames_list(TAGGERS)}
 
-
 users = {u["id"]: u for u in mm.get_users(in_channel=channel)}
-
 for user in users.values():
 	assert user["username"].find(" ") == -1, f"{user['username']} shouldn't have spaces in username"
 
@@ -92,7 +90,9 @@ def get_username(userid):
 	if userid not in users:
 		users[userid] = mm.get_user(userid)
 
-	return users[userid]["username"]
+	username = users[userid]["username"]
+	assert username.find(" ") == -1, f"{username} shouldn't have spaces in username"
+	return username
 
 
 ##################################