[FIX] Notification stream throwing an error when there isn't a message on payload (#2637)

app/lib/methods/subscriptions/rooms.js

@@ -355,7 +355,7 @@ export default function subscribeRooms() {
 				notification.avatar = RocketChat.getRoomAvatar(room);
 
 				// If it's from a encrypted room
-				if (message.t === E2E_MESSAGE_TYPE) {
+				if (message?.t === E2E_MESSAGE_TYPE) {
 					// Decrypt this message content
 					const { msg } = await Encryption.decryptMessage({ ...message, rid });
 					// If it's a direct the content is the message decrypted