Xpra: Ticket #1747: Xpra info failing with traceback

Sorry, I have another "feature broken with traceback" ticket. As usual, the server is a Fedora 26 trunk r18035 (freshly updated).

When running xpra info I get this traceback:

Exception in thread parse:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 804, in __bootstrap_inner
    self.run()
  File "/usr/lib64/python2.7/threading.py", line 757, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/xpra/net/protocol.py", line 738, in _read_parse_thread_loop
    self._internal_error("error in network packet reading/parsing", e, exc_info=True)
  File "/usr/lib64/python2.7/site-packages/xpra/net/protocol.py", line 676, in _internal_error
    log.error("Error: %s", message, exc_info=ei)
  File "/usr/lib64/python2.7/site-packages/xpra/log.py", line 379, in error
    self.log(logging.ERROR, msg, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/xpra/log.py", line 366, in log
    global_logging_handler(self.logger.log, level, msg, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/xpra/log.py", line 111, in standard_logging
    log(level, msg, *args, **kwargs)
  File "/usr/lib64/python2.7/logging/__init__.py", line 1231, in log
    self._log(level, msg, args, **kwargs)
  File "/usr/lib64/python2.7/logging/__init__.py", line 1286, in _log
    self.handle(record)
  File "/usr/lib64/python2.7/logging/__init__.py", line 1296, in handle
    self.callHandlers(record)
  File "/usr/lib64/python2.7/logging/__init__.py", line 1335, in callHandlers
    if record.levelno >= hdlr.level:
  File "/usr/lib64/python2.7/codecs.py", line 401, in __getattr__
    return getattr(self.stream, name)
AttributeError: 'file' object has no attribute 'level'