use .get instead of direct access in repr for normalized document
use .get instead of direct access in repr for normalized document

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