Update fluent() helper (#56900)

* Update fluent() helper

* spacing

* Update helpers.php

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: tanthammar

src/Illuminate/Support/helpers.php

@@ -172,11 +172,11 @@ function filled($value): bool
     /**
      * Create a Fluent object from the given value.
      *
-     * @param  object|array  $value
+     * @param  iterable|object|null  $value
      */
-    function fluent($value): Fluent
+    function fluent($value = null): Fluent
     {
-        return new Fluent($value);
+        return new Fluent($value ?? []);
     }
 }