ULG PATCH: gracefully handle non UTF-8 output of whois

[Frederik Kriewitz]

Fixes exeptions like this (in case whois returns non utf-8 output):
ERROR in CGI: Traceback (most recent call last):
    File "/var/www/html/ulg.py", line 775, in <module>
    handler.whois(**params)
    File "/var/www/html/ulg.py", line 738, in whois
    print self.runULGWhois(key,objtype)
    File "/var/www/html/ulg.py", line 710, in runULGWhois
    res = whois.lookup(key)
    File "/var/www/html/whois.py", line 43, in lookup
    res=res+l.decode('utf-8')
    File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xf3 in position 24:
invalid continuation byte