[bug] bpython crashes #902

Traceback (most recent call last):
  File "/tmp/test1/venv/bin/bpython", line 8, in <module>
    sys.exit(main())
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/curtsies.py", line 201, in main
    exit_value = repl.mainloop(True, paste)
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/curtsies.py", line 115, in mainloop
    while self.module_gatherer.find_coroutine():
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/importcompletion.py", line 226, in find_coroutine
    next(self.find_iterator)
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/importcompletion.py", line 217, in find_all_modules
    for module in self.find_modules(p):
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/importcompletion.py", line 202, in find_modules
    for subname in self.find_modules(path_real):
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/importcompletion.py", line 202, in find_modules
    for subname in self.find_modules(path_real):
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/importcompletion.py", line 202, in find_modules
    for subname in self.find_modules(path_real):
  [Previous line repeated 1 more time]
  File "/tmp/test1/venv/lib/python3.8/site-packages/bpython/importcompletion.py", line 199, in find_modules
    stat = path_real.stat()
  File "/usr/lib/python3.8/pathlib.py", line 1198, in stat
    return self._accessor.stat(self)
FileNotFoundError: [Errno 2] No such file or directory: '/sys/kernel/security/apparmor/apparmorfs:[12490]'