Crowd doesn't fall back onto drupal authentication unless LDAPAuth module is installed

This code seems to prevent the user from authenticating against drupal when crowd fails unless the ldapauth module is installed.

    // Crowd Authentication failed
    if(CROWD_USELDAP) {
      /**
       * The LDAPAUTH_LOGIN_PROCESS variable will match one of the following (string) values:
       *   - 0 :: This means that ldapauth is configured in mixed mode; LDAP authentication is performed only if Drupal authentication fails
       *   - 1 :: This means that ldapauth is configured to use the LDAP directory only 
       */
      if(LDAPAUTH_LOGIN_PROCESS === "0") {
        // If we are in mixed mode, attempt to authenticate in Drupal
        $crowd_auth = FALSE;
        user_authenticate($form_state['values']);
      }