fixed null date column blew up array flip (#165)

src/Support/ResponseExtractor/ModelInfo.php

@@ -321,6 +321,7 @@ protected function getCastType($column, $model)
     protected function getCastsWithDates($model)
     {
         return collect($model->getDates())
+            ->filter()
             ->flip()
             ->map(fn () => 'datetime')
             ->merge($model->getCasts());

tests/Support/ResponseExtractor/ModelInfoTest.php

@@ -0,0 +1,16 @@
+<?php
+
+use Dedoc\Scramble\Support\ResponseExtractor\ModelInfo;
+
+it('handles model without updated_at column', function () {
+    $modelInfo = new ModelInfo(UserModelWithoutUpdatedAt::class);
+
+    $modelInfo->handle();
+})->expectNotToPerformAssertions();
+
+class UserModelWithoutUpdatedAt extends \Illuminate\Database\Eloquent\Model
+{
+    protected $table = 'users';
+
+    const UPDATED_AT = null;
+}