gmx cluster -clndx is broken
Affected version - extra info:
Did not test 2018 versions, but suspect the same there. Also happens in master.
During writing tests and replacing the functionality I noticed that it seems to be broken during the creation of the underlying datastructure.
Test case files are attached.
Commandline used was
gmx trjconv -sub clusters.ndx -f traj.trr -o test.xtc
Clusters where prepared from traj.trr using this command
gmx cluster -clndx -f traj.trr -s topol.tpr -n spc-dimer.ndx -cutoff 0.0015