Cannot invite external user using 3pid

[Peter2121]

Description

When I try to invite an external user to a room on my server - I get an error.

Steps to reproduce

• Install my own home server
• Configure my own ID server (mxisd)
• Configure and test federation
• Invite au user from matrix.org using his e-mail addresse (NOT in matrix.org SMTP domain)

Version information

Synapse 0.34.1.1
Installed on FreeBSD from package (official repository).

Riot 1.0.1
Mxisd 1.3.1

Domain bimp.fr
Server chat.bimp.fr

I get the following stacktrace on synapse:

-- <exception caught here> ---
  File "/usr/local/lib/python2.7/site-packages/synapse/http/server.py", line 81, in wrapped_request_handler
    yield h(self, request)
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/local/lib/python2.7/site-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/local/lib/python2.7/site-packages/synapse/http/server.py", line 316, in _async_render
    callback_return = yield callback(request, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/local/lib/python2.7/site-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/local/lib/python2.7/site-packages/synapse/rest/client/v1/room.py", line 669, in on_POST
    txn_id
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/local/lib/python2.7/site-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/local/lib/python2.7/site-packages/synapse/handlers/room_member.py", line 643, in do_3pid_invite
    txn_id=txn_id
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/local/lib/python2.7/site-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/local/lib/python2.7/site-packages/synapse/handlers/room_member.py", line 754, in _make_and_store_3pid_invite
    inviter_avatar_url=inviter_avatar_url
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/local/lib/python2.7/site-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/local/lib/python2.7/site-packages/synapse/handlers/room_member.py", line 854, in _ask_id_server_for_third_party_invite
    invite_config
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1386, in _inlineCallbacks
    result = g.send(result)
  File "/usr/local/lib/python2.7/site-packages/synapse/http/client.py", line 340, in post_urlencoded_get_json
    raise HttpResponseException(response.code, response.phrase, body)
exceptions.UnboundLocalError: local variable 'body' referenced before assignment

[richvdh]

fixed by #4460. Please check the latest release before reporting bugs.