Do not decode None

youtube_dl/__init__.py

@@ -506,6 +506,7 @@ def _real_main():
 
     if sys.version_info < (3,):
         # In Python 2, sys.argv is a bytestring (also note http://bugs.python.org/issue2128 for Windows systems)
+        if opts.outtmpl is not None:
             opts.outtmpl = opts.outtmpl.decode(preferredencoding())
     outtmpl =((opts.outtmpl is not None and opts.outtmpl)
             or (opts.format == '-1' and opts.usetitle and u'%(title)s-%(id)s-%(format)s.%(ext)s')