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You're missing the message_info node, which seems to make rosserial rather unhappy.

The socket.launch launch file in rosserial_server starts this (here):

<launch>
  <node pkg="rosserial_server" type="socket_node" name="rosserial_server" />
  <node pkg="rosserial_python" type="message_info_service.py" name="rosserial_message_info" />
</launch>

I'd try to launch the launch file instead of rosrunning the single node and see whether things improve.