docs: def render(self, template, **kwargs):
          """Renders the template
  
          :param template: The template to render.
              The template is actually a file, which is usually generated
              by :class:`rtcclient.template.Templater.getTemplate`
              and can also be modified by user accordingly.
          :param kwargs: The `kwargs` dict is used to fill the template.
              These two parameter are mandatory:
  
                  * description
                  * title
  
              Some of below parameters (which may not be included in some
              customized workitem type ) are mandatory if `keep` (parameter in
              :class:`rtcclient.template.Templater.getTemplate`) is set to
              `False`; Optional for otherwise.
  
                  * teamArea (Team Area)
                  * ownedBy (Owned By)
                  * plannedFor(Planned For)
                  * severity(Severity)
                  * priority(Priority)
                  * filedAgainst(Filed Against)
  
              Actually all these needed keywords/attributes/fields can be
              retrieved by :class:`rtcclient.template.Templater.listFields`
  
          :return: the :class:`string` object
          :rtype: string
          """
  
          try:
              temp = self.environment.get_template(template)
              return temp.render(**kwargs)
          except AttributeError:
              err_msg = "Invalid value for 'template'"
              self.log.error(err_msg)
              raise exception.BadValue(err_msg)