Fix channel crash when publishing to a new stream

[mkuratczyk]

The following scenario led to a channel crash:

1. Publish to a non-existing stream: perf-test -y 0 -p -e amq.default -t direct -k stream
2. Declare the stream: rabbitmqadmin declare queue name=stream queue_type=stream

There is no pid yet, so we got a function_clause with none

{function_clause,
   [{osiris_writer,write,
        [none,<0.877.0>,<<"<0.877.0>_-65ZKFz18ll5lau0phi7CsQ">>,1,
         [[0,"Sp",[192,6,5,"B@@AC"]],
          [0,"Sr",
           [193,38,4,
            [[[163,10,<<"x-exchange">>],[161,0,<<>>]],
             [[163,13,<<"x-routing-key">>],[161,6,<<"stream">>]]]]],
          [0,"Su",[160,12,[<<0,19,252,1,0,0,98,171,20,16,108,167>>]]]]],
        [{file,"src/osiris_writer.erl"},{line,158}]},
    {rabbit_stream_queue,deliver0,4,
        [{file,"rabbit_stream_queue.erl"},{line,540}]},
    {rabbit_stream_queue,'-deliver/3-fun-0-',4,
        [{file,"rabbit_stream_queue.erl"},{line,526}]},
    {lists,foldl,3,[{file,"lists.erl"},{line,2146}]},
    {rabbit_queue_type,'-deliver0/4-fun-5-',5,
        [{file,"rabbit_queue_type.erl"},{line,707}]},
    {maps,fold_1,4,[{file,"maps.erl"},{line,860}]},
    {rabbit_queue_type,deliver0,4,
        [{file,"rabbit_queue_type.erl"},{line,704}]},
    {rabbit_queue_type,deliver,4,
        [{file,"rabbit_queue_type.erl"},{line,662}]}]}