code: public String getExcludedUsers() {
  
          if (CmsStringUtil.isEmptyOrWhitespaceOnly(m_excludedUsers)) {
              getToNames();
          }
          if (CmsStringUtil.isEmptyOrWhitespaceOnly(m_excludedUsers)) {
              return "";
          }
          return m_excludedUsers;
      }
docs: Returns a warning if users have been excluded.<p>
  
  @return a warning