Fix test_xmlrpc and make the CGI handler work with no CONTENT_LENGTH.

Lib/SimpleXMLRPCServer.py

@@ -600,7 +600,7 @@ def handle_request(self, request_text = None):
             # POST data is normally available through stdin
             try:
                 length = int(os.environ.get('CONTENT_LENGTH', None))
-            except ValueError:
+            except (TypeError, ValueError):
                 length = -1
             if request_text is None:
                 request_text = sys.stdin.read(length)