message: Ensure valid filtration before setting it in cech
diff: @@ -130,7 +130,8 @@ class Cech_blocker {
  #ifdef DEBUG_TRACES
  if (radius > cc_ptr_->max_radius()) std::clog << "radius > max_radius => expansion is blocked\n";
  #endif // DEBUG_TRACES
  - sc_ptr_->assign_filtration(sh, radius);
  + // Check that the filtration to be assigned (radius) would be valid
  + if (radius > sc_ptr_->filtration(sh)) sc_ptr_->assign_filtration(sh, radius);
  return (radius > cc_ptr_->max_radius());
  }
  