added empty condition at top

	public function validateRecoveryEmail(string $username, string $recoveryEmail) : bool {

		$user = $this->userManager->get($username);

		$email = $user->getEMailAddress();

		if (!empty($recoveryEmail)) {

			if (!filter_var($recoveryEmail, FILTER_VALIDATE_EMAIL)) {

				$this->logger->info("User  $username's requested recovery email does not match email format");

				throw new InvalidRecoveryEmailException();

				$this->logger->info("User ID $username's requested recovery email is the same as email");

				throw new SameRecoveryEmailAsEmailException();

			}

		if (!empty($recoveryEmail) && $this->isRecoveryEmailTaken($username, $recoveryEmail)) {

			if ($this->isRecoveryEmailTaken($username, $recoveryEmail)) {

				$this->logger->info("User ID $username's requested recovery email address is already taken");

				throw new RecoveryEmailAlreadyFoundException();

			}

		if (!empty($recoveryEmail) && $this->isRecoveryEmailDomainDisallowed($recoveryEmail)) {

			if ($this->isRecoveryEmailDomainDisallowed($recoveryEmail)) {

				$this->logger->info("User ID $username's requested recovery email address is disallowed.");

				throw new MurenaDomainDisallowedException();

			}

		}

		return true;

	}

	public function isRecoveryEmailDomainDisallowed(string $recoveryEmail): bool {