Bot may not be able to get avatar from unknown user.

diff --git a/bot.py b/bot.py
index 150edb2..f82434e 100755 (executable)
--- a/bot.py
+++ b/bot.py
@@ -213,11 +213,15 @@ def do_commands(message, command, raw, non_admin):
       url = m.group(1)
       m = re.match(r'<@(\d+)>', url)
       if m is not None:
+        other = None
         id = str(m.group(1))
         for member in client.get_all_members():
           if member.id == id:
             other = member
-        if other is not None:
+        if other is None:
+          log.warning("Can't see requested user {}".format(url))
+          url = None
+        else:
           url = other.avatar_url
     elif len(message.attachments):
       url = message.attachments[0]['url']