Add None-safe substr
Add None-safe substr

zamattiac/SHARE,aaxelb/SHARE,aaxelb/SHARE,zamattiac/SHARE,CenterForOpenScience/SHARE,laurenbarker/SHARE,CenterForOpenScience/SHARE,laurenbarker/SHARE,aaxelb/SHARE,zamattiac/SHARE,laurenbarker/SHARE,CenterForOpenScience/SHARE