Handle 404 response when a user with karma no longer exists

When a user which has karma deletes there account on pnut.io a 404
is generated on user lookup. This will handle the error gracefully
and allow the !karma command to complete which resolves issue #2.

A more complete for this should be to delete the karma entry for
the now invalid user, to be done in another commit.

partybot/pnutbot.py

@@ -103,7 +103,7 @@ def optout(msg):
         db_session.add(entry)
         db_session.commit()
 
-    reply = "@" + msg.user.username 
+    reply = "@" + msg.user.username
     reply += " you have been removed from the karma table"
     send(msg.channel_id, reply)
 
@@ -154,8 +154,12 @@ def karma(room):
     reply = "Karma standings\n\n"
     results = Karma.query.filter(Karma.chanid == room).order_by(Karma.karma.desc()).all()
     for entry in results:
-        user, meta = pnutpy.api.get_user(entry.userid)
+        try:
-        reply += user.username + ": " + str(entry.karma) + "\n"
+            user, meta = pnutpy.api.get_user(entry.userid)
+            reply += user.username + ": " + str(entry.karma) + "\n"
+
+        except pnutpy.errors.PnutMissing:
+            continue
     send(room, reply)
 
 def chimpnut(msg):
@@ -163,7 +167,7 @@ def chimpnut(msg):
     if prefs is None:
         prefs = Preferences(userid=msg.user.id, chimpnut=False)
         db_session.add(prefs)
-    
+
     if prefs.chimpnut:
         prefs.chimpnut = False
         reply = "@" + msg.user.username + " ChimPnut alert is now disabled"
@@ -182,16 +186,16 @@ def on_command(msg):
 
     elif args[0] == "!botsnack":
         botsnack(msg.channel_id)
-    
+
     elif args[0] == "!botdrink":
         botdrink(msg.channel_id)
-    
+
     elif args[0] == "!optout":
         optout(msg)
-    
+
     elif args[0] == "!optin":
         optin(msg)
-    
+
     elif args[0] == "!chimpnut":
         chimpnut(msg)
 
@@ -215,7 +219,7 @@ def on_vote(msg, matcher):
             reply += " silly human, your karma must be decided by others!"
             send(msg.channel_id, reply)
             return
-    
+
     except pnutpy.errors.PnutMissing:
         reply = "@" + msg.user.username
         reply += " I do not know who that is"
@@ -267,7 +271,7 @@ def on_mndp(msg):
 
     if "NowPlaying" not in tags:
         return
-    
+
     for m in mentions:
         addkarma = False
         try:
@@ -307,7 +311,7 @@ def on_message(ws, message):
         logger.debug("connection_id: " + msg['meta']['connection_id'])
         subscribe(msg['meta']['connection_id'])
         return
-    
+
     if 'data' in msg:
 
         if "channel_type" in msg['meta'] and msg['meta']['channel_type'] == "io.pnut.core.chat":
@@ -367,7 +371,7 @@ def on_open(ws):
                 step += 1
             time.sleep(5)
         logger.debug("*** terminate ***")
-    
+
     t = threading.Thread(target=run)
     t.start()
 
@@ -420,7 +424,7 @@ def main():
     ws_url += "?access_token=" + config['ACCESS_TOKEN']
 
     # setup the websocket connection
-    ws = websocket.WebSocketApp(ws_url, on_message=on_message, 
+    ws = websocket.WebSocketApp(ws_url, on_message=on_message,
         on_error=on_error, on_close=on_close)
     ws.on_open = on_open
     r = True