Add pop throttle kwarg for not-set settings
Add pop throttle kwarg for not-set settings

mehanig/scrapi,felliott/scrapi,jeffreyliu3230/scrapi,CenterForOpenScience/scrapi,CenterForOpenScience/scrapi,mehanig/scrapi,ostwald/scrapi,fabianvf/scrapi,erinspace/scrapi,fabianvf/scrapi,alexgarciac/scrapi,icereval/scrapi,felliott/scrapi,erinspace/scrapi