Patch users not existing when opening settings

Fixes element-hq/element-web#9022

src/components/views/settings/ProfileSettings.js

@@ -28,7 +28,15 @@ export default class ProfileSettings extends React.Component {
         super();
 
         const client = MatrixClientPeg.get();
-        const user = client.getUser(client.getUserId());
+        let user = client.getUser(client.getUserId());
+        if (!user) {
+            // XXX: We shouldn't have to do this.
+            // There seems to be a condition where the User object won't exist until a room
+            // exists on the account. To work around this, we'll just create a temporary User
+            // and use that.
+            console.warn("User object not found - creating one for ProfileSettings");
+            user = new User(client.getUserId());
+        }
         let avatarUrl = user.avatarUrl;
         if (avatarUrl) avatarUrl = client.mxcUrlToHttp(avatarUrl, 96, 96, 'crop', false);
         this.state = {