Bug fix for unset var in close call

borg.backup.functions.close.sh

@@ -3,7 +3,7 @@
 # unset borg settings
 unset BORG_BASE_DIR BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK BORG_RELOCATED_REPO_ACCESS_IS_OK
 # error abort without duration and error notice
-if [ $1 == 1 ]; then
+if [ $# -ge 1 ] && [ $1 = 1 ]; then
 	echo "=== [ERROR: $(date +'%F %T')] ==[${MODULE}]====================================>";
 else
 	DURATION=$[ $(date +'%s')-$START ];