Fix first edit of images

capsule-prototype/js/online-script.js

@@ -1045,7 +1045,7 @@ function openImageEdition(message, tag) {
 	let markerArea = new markerjs2.MarkerArea($('#annotation_img_edit')[0]);
 	let imageState;
 
-	if (tag.getMetadata("Rekall->MarkerjsState").length){
+	if (tag.getMetadata("Rekall->MarkerjsState") && tag.getMetadata("Rekall->MarkerjsState").trim().length){
 		imageState = JSON.parse(atob(tag.getMetadata("Rekall->MarkerjsState")));
 	}