This problem is quite common and is usually associated with some errors that are not observed in the CLI, for example, in custom classes that do not load, are you sure that you are reporting errors?
Edit the artisan file and add the following lines immediately after the PHP opening tag <?php :
ini_set('display_errors',1); error_reporting(-1);
Try artisan again and see if there is any output.
If this does not work, try returning app/start/global.php to this default state.
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