Add support in morphTo relationship for null values (1547) (#1549)

Co-authored-by: Barry vd. Heuvel <[email protected]>

tests/Console/ModelsCommand/Morphs/Models/Morphs.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\Morphs\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+
+class Morphs extends Model
+{
+    public function relationMorphTo(): MorphTo
+    {
+        return $this->morphTo();
+    }
+
+    public function nullableRelationMorphTo(): MorphTo
+    {
+        return $this->morphTo();
+    }
+}