[Orekit Users] problem cloning dsst

[<w.grossman@ieee.org>]

I tried to clone the dsst lab project and got the following git clone error.
Here's the command line feedback:

git clone
https://www.orekit.org/git/orekit-labs/orekit-dsst-orbit-determination.git
Cloning into 'orekit-dsst-orbit-determination'...
remote: Counting objects: 76052, done.
remote: Compressing objects: 100% (18019/18019), done.
remote: Total 76052 (delta 46806), reused 74516 (delta 45558)
Receiving objects: 100% (76052/76052), 45.79 MiB | 357.00 KiB/s, done.
Resolving deltas: 100% (46806/46806), done.
warning: remote HEAD refers to nonexistent ref, unable to checkout.


Suggestions?  Again, I am not a git expert so I apologize in advance if this
is something I should know.