code: def get_platform_node_selector(self, platform):
          
          nodeselector = {}
          if platform:
              nodeselector_str = self._get_value("node_selector." + platform, self.conf_section,
                                                 "node_selector." + platform)
              nodeselector = self.generate_nodeselector_dict(nodeselector_str)
  
          return nodeselector
docs: search the configuration for entries of the form node_selector.platform
          :param platform: str, platform to search for, can be null
          :return dict