[Plugin] auth_ldap: Fixed exception if no avatar is set on backend.

flaschengeist/plugins/auth_ldap/__init__.py

@@ -137,11 +137,11 @@ class AuthLDAP(AuthPlugin):
             "ou=user,{}".format(self.dn),
             "(uid={})".format(user.userid),
             SUBTREE,
-            attributes=["uid", "jpegPhoto"],
+            attributes=["jpegPhoto"],
         )
         r = self.ldap.connection.response[0]["attributes"]
 
-        if r["uid"][0] == user.userid:
+        if "jpegPhoto" in r and len(r["jpegPhoto"]) > 0:
             avatar = _Avatar()
             avatar.mimetype = "image/jpeg"
             avatar.binary.extend(r["jpegPhoto"][0])