message: Declare variable even on the error path.
diff: @@ -1238,6 +1238,7 @@ class Cover_complex {
  #elif defined GUDHI_GIC_USE_HERA
  double db = hera::bottleneckDistExact(this->PD, Cboot.PD);
  #else
  + double db;
  throw std::logic_error("This function requires CGAL or Hera for the bottleneck distance.");
  #endif
  if (verbose) std::clog << db << std::endl;
  