bugifx for using compute chunk/atom with compress via rerun or right at the beginning of a run

src/compute_chunk_atom.cpp

@@ -712,13 +712,14 @@ void ComputeChunkAtom::compute_ichunk()
     return;
   }
 
-  invoked_ichunk = update->ntimestep;
-
   // assign chunk IDs to atoms
   // will exclude atoms not in group or in optional region
   // already invoked if this is same timestep as last setup_chunks()
+  // however, when between runs or using rerun, we need it again.
 
-  if (update->ntimestep > invoked_setup) assign_chunk_ids();
+  if ((update->ntimestep > invoked_setup) || (invoked_ichunk < 0)) assign_chunk_ids();
+
+  invoked_ichunk = update->ntimestep;
 
   // compress chunk IDs via hash of the original uncompressed IDs
   // also apply discard rule except for binning styles which already did