patch 8.2.0074: Python 3 unicode test someitmes fails

Problem:    Python 3 unicode test someitmes fails.
Solution:   Make 'termencoding' empty.  Correct number of error message.
diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index af53e64..9e4937b 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -76,7 +76,7 @@
 LIST OF MESSAGES
 			*E222* *E228* *E232* *E256* *E293* *E298* *E304* *E317*
 			*E318* *E356* *E438* *E439* *E440* *E316* *E320* *E322*
-			*E323* *E341* *E473* *E570* *E685* *E950*  >
+			*E323* *E341* *E473* *E570* *E685* *E292*  >
   Add to read buffer
   makemap: Illegal mode
   Cannot create BalloonEval with both message and callback