code: def _get_hdr_childcnt(self, goobj, ntgo):
          
          if 'childcnt' in self.present:
              return "c{N}".format(N=len(goobj.children))
          elif self.gosubdag.relationships and not goobj.children and ntgo.dcnt != 0:
              return "c0"
docs: Get string representing count of children for this GO term.