Replace unknown chars instead of raising.

apachedex/__init__.py

@@ -799,7 +799,8 @@ period_parser = {
   ),
 }
 
-unquoteToHtml = lambda x, encoding: escape(unquote(x).decode(encoding))
+unquoteToHtml = lambda x, encoding: escape(unquote(x).decode(encoding,
+  'replace'))
 
 def asHTML(out, encoding, per_site, args, default_site, period_parameter_dict,
     stats, site_caption_dict):