Notice that enrollee name/email not listed

After checkout, I see two alerts:

Please enter a correct name to participant #1
Please enter a correct email to participant #1

Even after having added an enrollee name and email on the checkout page.

I looked at the Github code, and wouldn’t these lines be if (empty... instead of if ( !empty...

in class-wc-registrations-checkout.php, lines 119-127:

				for( $i = 1; $i <= $qty; $i++, $registrations++ ) {
					// Check if field is set, if it's not set add an error.
					if ( ! empty( $_POST['participant_name_' . $registrations] ) ) {
						wc_add_notice( sprintf( __( 'Please enter a correct name to participant #%u ', 'registrations-for-woocommerce' ), $registrations ) );
					}
					if ( ! empty( $_POST['participant_email_' . $registrations ] ) ) {
						wc_add_notice( sprintf( __( 'Please enter a correct email to participant #%u ', 'registrations-for-woocommerce' ), $registrations ) );
					}

It is adding the first name and email address to the Woocommerce Order in the orders screen.