Summary
There's no need to call the /siteverify endpoint if the client hasn't supplied a token.
Notes
- Should probably revert most or all of rECOE78816b7f3df1: hCaptcha: Handle requests without a token as part of this task
Acceptance criteria
- Calls to /siteverify are not made when $token is null in passCaptcha(), and a log message is generated when this is the case