xmpp: Fix webhook not working if using avatar relaying

xmpp_discord_bridge/avatar.py

@@ -74,4 +74,5 @@ class AvatarManager:
         """
         Returns either the URL to the avatar of @jid or None.
         """
-        return self._avatars.get(jid, None)
+        filename = self._avatars.get(jid, None)
+        return self._public + filename if filename else None

xmpp_discord_bridge/main.py

@@ -263,11 +263,16 @@ class BridgeComponent(ComponentXMPP):
 
         self._logger.debug("Webhook: %s", str(webhook))
             
-        requests.post(self._webhooks[muc],
+        req = requests.post(self._webhooks[muc],
                             data=webhook,
                             headers={
                                 "Content-Type": "application/json"
                             })
+        if req.status_code != 200:
+            self._logger.error("Failed to POST to %s with content %s: %s",
+                               self._webhooks[muc],
+                               str(webhook),
+                               req.text)
 
     def virtual_user_update_presence(self, muc, uid, pshow, pstatus=None):
         """