Unit test fail if there is other plugin which implements pre_course_delete

[tuanngocnguyen]

If there is plugin implements pre_course_delete hook and trying to access the invalid course module, different error will be throw

1. tool_lifecycle\process_error_test::test_process_error_in_table
   Failed asserting that 'moodle_exception: Invalid course module ID' contains "Trying to get property 'id' of non-object".

/var/www/site/admin/tool/lifecycle/tests/process_error_test.php:114
/var/www/site/lib/phpunit/classes/advanced_testcase.php:80
phpvfscomposer:///var/www/site/vendor/phpunit/phpunit/phpunit:60

To re-run:
vendor/bin/phpunit "tool_lifecycle\process_error_test" admin/tool/lifecycle/tests/process_error_test.php