Error in reading empty serials

[m-planck]

Hidapi responds to empty serial numbers with a unicode charakter u'\u0409'.
This gives an error on ASCII terminals or on Windows with different codepages:
" return codecs.charmap_encode(input,errors,encoding_map)
UnicodeEncodeError: 'charmap' codec can't encode character u'\u0409' in position
16: character maps to

The serial number field is explicitly declared in hid.c as unicode type for no apparent reason. Other fields like manufacturer, product etc are declared as normal strings, so there is no error.

Used system: Win7 x64
Python 2.7.6 (default, Nov 10 2013, 19:24:18) [MSC v.1500 32 bit (Intel)] on win

import sys
sys.stdout.encoding
'cp850'