don't create lock for to early

lib/import_images

@@ -6,7 +6,6 @@ import_images() {
 	exec 2>> images.log
 	declare -r oldIFS="$IFS"
 	[[ -r .importing ]] && return 2
-	touch .importing
 	[[ -w "$rrdfile" ]] || rrdcreate
 	readlast
 	for file in dav/*
@@ -17,6 +16,8 @@ import_images() {
 		IFS="$oldIFS"
 		if (( $(date '+%Y%m%d%H%M%S' -d @${last[time]}) <  $date$time ))
 		then
+			[[ -r .importing ]] && return 2
+			touch .importing
 			imagetime="${date:0:4}/${date:4:2}/${date:6:2} ${time:0:2}:${time:2:2}:${time:4:2}"
 			echo "$(date +"%Y/%m/%d:%H:%M:%S") - $file: $imagetime"
 			timestamp=$(date +%s -d "$imagetime")