fix: remove async.series, dont crash if postAtIndex is undefined

src/controllers/topics.js

@@ -289,17 +289,11 @@ async function addTags(topicData, req, res) {
 }
 
 async function addOGImageTags(res, topicData, postAtIndex) {
-	const images = [];
+	const uploads = postAtIndex ? await posts.uploads.listWithSizes(postAtIndex.pid) : [];
-
+	const images = uploads.map((upload) => {
-	async.series([
-		async function () {
-			const uploads = await posts.uploads.listWithSizes(postAtIndex.pid);
-			uploads.forEach((upload) => {
 		upload.name = nconf.get('url') + nconf.get('upload_url') + '/files/' + upload.name;
-				images.push(upload);
+		return upload;
 	});
-		},
-		function (next) {
 	if (topicData.thumb) {
 		images.push(topicData.thumb);
 	}
@@ -309,12 +303,7 @@ async function addOGImageTags(res, topicData, postAtIndex) {
 	if (postAtIndex && postAtIndex.user && postAtIndex.user.picture) {
 		images.push(postAtIndex.user.picture);
 	}
-
-			process.nextTick(next);
-		},
-	], function () {
 	images.forEach(path => addOGImageTag(res, path));
-	});
 }
 
 function addOGImageTag(res, image) {