fix Exception: Cannot traverse an already closed generator when running Arr::first with an empty generator and no callback (#48851)

* fix Exception: Cannot traverse an already closed generator when running Arr::first with an empty generator and no callback

* styling

* should use default return

Author: moshe-autoleadstar

src/Illuminate/Collections/Arr.php

@@ -195,6 +195,8 @@ public static function first($array, callable $callback = null, $default = null)
             foreach ($array as $item) {
                 return $item;
             }
+
+            return value($default);
         }
 
         foreach ($array as $key => $value) {

tests/Support/SupportArrTest.php

@@ -214,6 +214,13 @@ public function testFirst()
         $this->assertSame('bar', $value3);
         $this->assertSame('baz', $value4);
         $this->assertEquals(100, $value5);
+
+        $cursor = (function () {
+            while (false) {
+                yield 1;
+            }
+        })();
+        $this->assertNull(Arr::first($cursor));
     }
 
     public function testJoin()