Fix error with login when user didn't exist

src/libs/middlewares/oauth2.js

@@ -68,7 +68,7 @@ aserver.exchange(oauth2orize.exchange.password((client, username, password, scop
             console.log('deu ruim');
             console.log(user);
             console.log(password);
-            console.log(user.checkPassword(password));
+            if(user) console.log(user.checkPassword(password));
             return done(null, false);
         }