Argument 3 passed to Drupal\features\Plugin\FeaturesGeneration\FeaturesGenerationWrite::failure() must be an instance of Exception, null given

Problem/Motivation

While trying to write a feature, there is a check to ensure something has been selected to be exported.
In the case where nothing has been selected, the following failure is generated:

$this->failure($return, $package, NULL, t('No configuration was selected to be exported.'));

The problem is that the failure() method awaits for an Exception object an get NULL. I thought it was OK but it seems that it's not.

Proposed resolution

Two solutions available:

1. Pass an Exception to the failure() method
   

   $this->failure($return, $package, new \Exception(t('No configuration was selected to be exported.')));
   

2. Add NULL as the default value for the $exception parameter of the failure() method:
   

   protected function failure(array &$return, Package $package, \Exception $exception = NULL, $message = '') {
   

Remaining tasks

Choose the prefered solution
Patch
Review
Commit

User interface changes

No

API changes

No

Data model changes

No