vim-patch:8.2.1069: Vim9: fail to check for white space in list

Problem:    Vim9: fail to check for white space in list.
Solution:   Add check for white space.

e6e031739c

N/A patches for version.c:

vim-patch:8.2.1070: Vim9: leaking memory when lacking white space in dict

Problem:    Vim9: leaking memory when lacking white space in dict.
Solution:   Clear the typval.

ab19d495fd

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/eval.c

@@ -4003,7 +4003,7 @@ static int get_list_tv(char **arg, typval_T *rettv, evalarg_T *const evalarg)
       tv_list_append_owned_tv(l, tv);
     }
 
-    // the comma must comma after the value
+    // the comma must come after the value
     bool had_comma = **arg == ',';
     if (had_comma) {
       *arg = skipwhite(*arg + 1);