fix get_repr_info - Githubissues

I found that the bug below occurred. This error occurs indefinitely.
2023-09-11 00:00:03     1|MainThread|CRITI|         handlers.py:1588 - Traceback (most recent call last):
  File "/usr/local/lib/python3.10/asyncore.py", line 90, in read
    obj.handle_read_event()
  File "/usr/local/lib/python3.10/asyncore.py", line 427, in handle_read_event
    self.handle_read()
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/ioloop.py", line 922, in handle_read
    asynchat.async_chat.handle_read(self)
  File "/usr/local/lib/python3.10/asynchat.py", line 125, in handle_read
    data = self.recv(self.ac_in_buffer_size)
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/ioloop.py", line 915, in recv
    self.handle_close()
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1591, in handle_close
    self.close()
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1595, in close
    debug("call: close()", inst=self)
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/log.py", line 135, in debug
    s += " (%r)" % inst
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1356, in __repr__
    return '<%s(%s)>' % (self.__class__.__name__, self.get_repr_info(True))
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1345, in get_repr_info
    if dc.use_sendfile():
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 642, in use_sendfile
    self.file_obj.fileno()
ValueError: I/O operation on closed file

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1586, in handle_error
    self.close()
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1595, in close
    debug("call: close()", inst=self)
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/log.py", line 135, in debug
    s += " (%r)" % inst
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1356, in __repr__
    return '<%s(%s)>' % (self.__class__.__name__, self.get_repr_info(True))
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 1345, in get_repr_info
    if dc.use_sendfile():
  File "/opt/venv/lib/python3.10/site-packages/pyftpdlib/handlers.py", line 642, in use_sendfile
    self.file_obj.fileno()
ValueError: I/O operation on closed file
I don't know the exact cause, but I made an exception to the error in the log recording part. Please review that part.
giampaolo / pyftpdlib

fix get_repr_info #608
