Rename folder fails when old name contains non-ASCII characters

[jlvermeulen]

I have a torrent with a root folder named e.g. けいおん. Trying to rename it raises the following exception:

Exception calling RPC request: 'ascii' codec can't decode byte 0xc3 in position 3: ordinal not in range(128)
Traceback (most recent call last):
  File "deluge\core\rpcserver.py", line 301, in dispatch
  File "deluge\core\core.py", line 739, in rename_folder
  File "deluge\core\torrent.py", line 1061, in rename_folder
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 3: ordinal not in range(128)