use get instead of setdefault for kwargs.
use get instead of setdefault for kwargs.

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