fix(mysql): ensure generating "utf8" for charset

When there are no "charset" files, nothing has been generated although
we intended to at least generate "utf8".  The check for the number of
generated candidates should be performed after generating "utf8".  The
wrong check has been introduced in commit 08dd2cd.

Originally, we have been performing the pathname expansions without
adjusting "nullglob", so the pattern "/usr/share/mysql/charsets/*.xml"
has been directly strayed into the array "charsets" unless "nullgob"
is set.  Then the check has been always passed when "nullglob" is not
set, which is the reason that we have been missing the problem until
now.

Author: akinomyoga

completions/mysql

@@ -4,12 +4,11 @@ _comp_xfunc_mysql_character_sets()
 {
     local -a charsets
     _comp_expand_glob charsets '/usr/share/m{ariadb,ysql}/charsets/*.xml'
-    if ((${#charsets[@]})); then
-        charsets=("${charsets[@]##*/}")
-        charsets=("${charsets[@]%%?(Index).xml}" utf8)
-        local IFS=$'\n'
-        COMPREPLY+=($(compgen -W '${charsets[@]}' -- "$cur"))
-    fi
+    charsets+=(utf8)
+    charsets=("${charsets[@]##*/}")
+    charsets=("${charsets[@]%%?(Index).xml}")
+    local IFS=$'\n'
+    COMPREPLY+=($(compgen -W '${charsets[@]}' -- "$cur"))
 }
 
 _comp_deprecate_func _mysql_character_sets _comp_xfunc_mysql_character_sets