vim-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.
4b7cdca230

runtime/doc/message.txt

@@ -69,7 +69,7 @@ See `:messages` above.
 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

src/nvim/change.c

@@ -757,7 +757,7 @@ int del_bytes(colnr_T count, bool fixpos_arg, bool use_delcombine)
   }
   // If "count" is negative the caller must be doing something wrong.
   if (count < 1) {
-    IEMSGN("E950: Invalid count for del_bytes(): %ld", count);
+    IEMSGN("E292: Invalid count for del_bytes(): %ld", count);
     return FAIL;
   }
 

src/nvim/options.lua

@@ -2488,12 +2488,6 @@ return {
       varname='p_tbidi',
       defaults={if_true={vi=false}}
     },
-    {
-      full_name='termencoding', abbreviation='tenc',
-      type='string', scope={'global'},
-      vi_def=true,
-      defaults={if_true={vi=""}}
-    },
     {
       full_name='termguicolors', abbreviation='tgc',
       type='bool', scope={'global'},

src/nvim/testdir/test_python3.vim

@@ -174,13 +174,20 @@ func Test_Catch_Exception_Message()
 endfunc
 
 func Test_unicode()
-  throw 'skipped: Nvim only supports "utf-8" for "encoding" option'
+  throw 'skipped: Nvim does not support "termencoding" option and only supports "utf-8" for "encoding" option'
   " this crashed Vim once
+  let save_tenc = &tenc
+  set tenc=
+
   set encoding=utf32
   py3 print('hello')
+
   set encoding=debug
   py3 print('hello')
+
   set encoding=euc-tw
   py3 print('hello')
+
   set encoding=utf8
+  let &tenc = save_tenc
 endfunc