Webservice API Documentation throws tool_behat autoload error

Hi there,

I just downloaded the latest stable Moodle (4.1+) release for Windows and setup the plain default platform installation.

When trying to view available webservice functions at Site administration > Server > Web services: API Documentation, I run into the following error:

Warning: require_once(<MOODLEROOT>\server\moodle/vendor/autoload.php): failed to open stream: No such file or directory in <MOODLEROOT>\server\moodle\admin\tool\behat\classes\external\get_entity_generator.php on line 31 

From what I've gathered, this bug was only introduced a few days ago in this commit which added get_entity_generator.php.

The problematic lines look like this:
 

30 require_once($CFG->libdir . '/externallib.php');

31 require_once($CFG->dirroot . '/vendor/autoload.php'); // Ensure we can load Behat and Facebook namespaces in behat libraries.

32 require_once($CFG->libdir . '/tests/behat/behat_data_generators.php');

In line 31, tool_behat is trying to load a script from the vendor directory, which doesn't exist in my Moodle instance.