Set the script_name_sep variable to a safe value if it is not

already set (e.g. a failed/skipped mergemaster run during an upgrade).
Without this, if script_name_sep was not set in the rc.conf files,
local scripts will not be executed on startup or shutdown.

PR:		misc/32687
Submitted by:	Nicholas Paufler <echofox@discordia.ca> (the problem)
		Sheldon Hearn (the idea behind the fix)
Reviewed by:	sheldonh
MFC after:	1 week

etc/rc

@@ -813,6 +813,9 @@ case ${local_startup} in
 *)
 	echo -n 'Local package initialization:'
 	slist=""
+	if [ -z "${script_name_sep}" ]; then
+		script_name_sep=" "
+	fi
 	for dir in ${local_startup}; do
 		if [ -d "${dir}" ]; then
 			for script in ${dir}/*.sh; do

etc/rc.shutdown

@@ -103,6 +103,9 @@ case ${local_startup} in
 	;;
 *)
 	slist=""
+	if [ -z "${script_name_sep}" ]; then
+		script_name_sep=" "
+	fi
 	for dir in ${local_startup}; do
 		if [ -d "${dir}" ]; then
 			for script in ${dir}/*.sh; do