Sometimes versions can be None
Sometimes versions can be None

Johnetordoff/waterbutler,rafaeldelucena/waterbutler,CenterForOpenScience/waterbutler,cosenal/waterbutler,TomBaxter/waterbutler,Ghalko/waterbutler,rdhyee/waterbutler,kwierman/waterbutler,icereval/waterbutler,felliott/waterbutler,RCOSDP/waterbutler,chrisseto/waterbutler,hmoco/waterbutler