Merge branch 'auth-already-authenticated' of https://github.com/mpyw-…

…forks/framework into mpyw-forks-auth-already-authenticated

GuardHelpers.php

@@ -40,6 +40,16 @@ public function authenticate()
         throw new AuthenticationException;
     }
 
+    /**
+     * Determine if the guard has the current user without triggering side effects.
+     *
+     * @return bool
+     */
+    public function hasUser()
+    {
+        return ! is_null($this->user);
+    }
+
     /**
      * Determine if the current user is authenticated.
      *