Data layer: return null if id not in database, not empty model

js/modules/data.js

@@ -254,6 +254,10 @@ async function _removeMessages(ids) {
 
 async function getMessageById(id, { Message }) {
   const message = await channels.getMessageById(id);
+  if (!message) {
+    return null;
+  }
+
   return new Message(message);
 }
 
@@ -352,6 +356,10 @@ async function getAllUnprocessed() {
 
 async function getUnprocessedById(id, { Unprocessed }) {
   const unprocessed = await channels.getUnprocessedById(id);
+  if (!unprocessed) {
+    return null;
+  }
+
   return new Unprocessed(unprocessed);
 }