Use `test -d` instead of `find` to check directory

proxmox/backup.pve.content.sh

@@ -77,7 +77,7 @@ is_directory_absent() {                                          # {{{
 
 	### Check if the directory exists
 	# shellcheck disable=SC2086
-	if find ${local_directory_absent} -type d > /dev/null 2>&1; then
+	if test -d "${local_directory_absent}"; then
 		return_is_directory_absent="1"
 		debug_message "is_directory_absent − \
 The directory ${RED}${local_directory_absent}${COLOR_DEBUG} exists."