Description of problem:
When sending books to Sony Reader PRS 505 I get an error message:
ERROR: Error: Error communicating with device

 ('ascii', u'\u0421\u044d\u043b\u0438\u043d\u0434\u0436\u0435\u0440, \u0414\u0436\u0435\u0440\u043e\u043c', 0, 9, 'ordinal not in range(128)')

Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/gui2/device.py", line 56, in run
    self.result = self.func(*self.args, **self.kwargs)
  File "/usr/lib/calibre/calibre/gui2/device.py", line 233, in _upload_books
    metadata=metadata, end_session=False)
  File "/usr/lib/calibre/calibre/devices/prs505/driver.py", line 132, in upload_books
    filepath = self.create_upload_path(path, mdata, fname)
  File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 811, in create_upload_path
    extra_components = get_components(template, mdata, fname)
  File "/usr/lib/calibre/calibre/library/save_to_disk.py", line 136, in get_components
    components = [safe_format(x, format_args) for x in components]
  File "/usr/lib/calibre/calibre/library/save_to_disk.py", line 99, in safe_format
    return x.format(**format_args).strip()
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-8: ordinal not in range(128)



Version-Release number of selected component (if applicable):
calibre-0.6.35

How reproducible:
Almost always

Steps to Reproduce:
1. Send a book to calibre 
  
Additional info:
I couldn't reporoduce (yet) this error with current upstream version - 0.6.36