Tolerate getfilesystemencoding returning None.

diff --git a/wrw/sp/cons.py b/wrw/sp/cons.py
index ff0d0af..1e3d678 100644 (file)
--- a/wrw/sp/cons.py
+++ b/wrw/sp/cons.py
@@ -40,7 +40,7 @@ class element(node):
         return self.__todom__(doc).toxml()
 
 class context(object):
-    charset = sys.getfilesystemencoding()
+    charset = (sys.getfilesystemencoding() or "ascii")
 
     def __init__(self):
         self.nodeconv = {}