[5.5] Make Optional@__call really macroable (#20898)

We need to firstly check existence of macro and only then pass it to the value. Otherwise it won't be really macroable (because macros won't work for Optional with value inside).

src/Illuminate/Support/Optional.php

@@ -48,12 +48,12 @@ public function __get($key)
      */
     public function __call($method, $parameters)
     {
-        if (is_object($this->value)) {
-            return $this->value->{$method}(...$parameters);
-        }
-
         if (static::hasMacro($method)) {
             return $this->macroCall($method, $parameters);
         }
+
+        if (is_object($this->value)) {
+            return $this->value->{$method}(...$parameters);
+        }
     }
 }