fix: do not include image or icon props if they are falsy values

src/activitypub/mocks.js

@@ -486,6 +486,7 @@ Mocks.actors.user = async (uid) => {
 	});
 
 	return {
+		...{
 			'@context': [
 				'https://www.w3.org/ns/activitystreams',
 				'https://w3id.org/security/v1',
@@ -501,8 +502,6 @@ Mocks.actors.user = async (uid) => {
 			name: username !== displayname ? fullname : username, // displayname is escaped, fullname is not
 			preferredUsername: userslug,
 			summary: aboutmeParsed,
-		icon: picture,
-		image: cover,
 			published: new Date(joindate).toISOString(),
 			attachment,
 
@@ -515,6 +514,9 @@ Mocks.actors.user = async (uid) => {
 			endpoints: {
 				sharedInbox: `${nconf.get('url')}/inbox`,
 			},
+		},
+		...(picture && { icon: picture }),
+		...(cover && { image: cover }),
 	};
 };