in some tier0 job there are many
tautrackslimmer                                   warning no or empty track container found in tds
tautrackslimmer                                   warning no or empty track container found in tds
tautrackslimmer                                   warning no or empty track container found in tds
this is because of:
http://alxr.usatlas.bnl.gov/lxr/source/atlas/reconstruction/taurec/src/tautrackslimmer.cxx#124
in some stream there can be no tracks reconstructed, this is perfectly legitimate and should not cause any warning. (it is ok to have a warning if the track collection is missing)
please fix in 16.6.x.y

