Copying empty file to MicroPython works, but hangs indefintely

$ ~/webrepl/webrepl_cli.py empty 192.168.4.1:
Password: 
op:put, host:192.168.4.1, port:8266, passwd:abcd.
empty -> /empty
Remote WebREPL version: (1, 9, 4)
Sent 0 of 0 bytes

After CTRL-C and login to REPL file "empty" is there:

...
upysh commands:
pwd, cd("new_dir"), ls, ls(...), head(...), tail(...), wc(...), cat(...),
newfile(...), mv("old", "new"), cp("src", "tgt"), rm(...),
grep("opt", "regex", "file"), od("opt", "file"), mkdir(...), rmdir(...), clear

>>> ls
    3208 FBConsole.py
     690 boot.py
     296 dup.py
     335 dup2.py
       0 empty
   10414 isalpha.py
...

micropython / webrepl

Copying empty file to MicroPython works, but hangs indefintely #41