Update get_id function to not save PDF urls as main link
Update get_id function to not save PDF urls as main link

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