title: Laravel db:seed does not work without --class parameter
body: <p>Running <code>php artisan db:seed</code> does not work for some reason on my Laravel 5.6 project.</p>
  
  <ul>
  <li>The command runs (quietly) even without a database</li>
  <li>Does not return any error on the terminal</li>
  </ul>
  
  <p>However, when I run <code>php artisan db:seed --class=ClassNameTableSeeder</code> it works. What could be the cause of such a weird behavior?</p>
  
  <p>NB : Similar to questions like <a href="https://stackoverflow.com/questions/39521913/laravel-5-3-dbseed-command-simply-doesnt-work">39521913</a> but not a duplicate.</p>