Document that model encrypter can also be null (#45574)

Author: axlon

src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php

@@ -179,7 +179,7 @@ trait HasAttributes
     /**
      * The encrypter instance that is used to encrypt attributes.
      *
-     * @var \Illuminate\Contracts\Encryption\Encrypter
+     * @var \Illuminate\Contracts\Encryption\Encrypter|null
      */
     public static $encrypter;
 
@@ -1289,7 +1289,7 @@ protected function castAttributeAsEncryptedString($key, $value)
     /**
      * Set the encrypter instance that will be used to encrypt attributes.
      *
-     * @param  \Illuminate\Contracts\Encryption\Encrypter  $encrypter
+     * @param  \Illuminate\Contracts\Encryption\Encrypter|null  $encrypter
      * @return void
      */
     public static function encryptUsing($encrypter)