Merge pull request #13014 from danieliancu/5.2

[5.2] Use isEmpty to check for empty message bag in the passes function of the Validator

src/Illuminate/Validation/Validator.php

@@ -431,7 +431,7 @@ public function passes()
             call_user_func($after);
         }
 
-        return count($this->messages->all()) === 0;
+        return $this->messages->isEmpty();
     }
 
     /**