fix: better handling for remote posts that do not contain content

src/activitypub/mocks.js

@@ -123,8 +123,12 @@ Mocks.post = async (objects) => {
 		let edited = new Date(updated);
 		edited = Number.isNaN(edited.valueOf()) ? undefined : edited;
 
+		if (content && content.length) {
 			content = sanitize(content, sanitizeConfig);
 			content = await activitypub.helpers.remoteAnchorToLocalProfile(content);
+		} else {
+			content = '<em>This post did not contain any content.</em>';
+		}
 
 		const payload = {
 			uid,