Fix bug in hook: ensure bin directory exists before listing.
Fix bug in hook: ensure bin directory exists before listing.

lgarren/spack,krafczyk/spack,matthiasdiener/spack,TheTimmy/spack,TheTimmy/spack,tmerrick1/spack,TheTimmy/spack,skosukhin/spack,EmreAtes/spack,TheTimmy/spack,EmreAtes/spack,lgarren/spack,mfherbst/spack,iulian787/spack,lgarren/spack,matthiasdiener/spack,LLNL/spack,krafczyk/spack,LLNL/spack,lgarren/spack,LLNL/spack,mfherbst/spack,iulian787/spack,skosukhin/spack,EmreAtes/spack,skosukhin/spack,mfherbst/spack,LLNL/spack,krafczyk/spack,matthiasdiener/spack,LLNL/spack,skosukhin/spack,TheTimmy/spack,EmreAtes/spack,krafczyk/spack,lgarren/spack,iulian787/spack,tmerrick1/spack,iulian787/spack,mfherbst/spack,krafczyk/spack,iulian787/spack,skosukhin/spack,EmreAtes/spack,tmerrick1/spack,matthiasdiener/spack,mfherbst/spack,tmerrick1/spack,tmerrick1/spack,matthiasdiener/spack