get the pandas tests working on machines that do not have pandas
get the pandas tests working on machines that do not have pandas

greglandrum/rdkit,bp-kelley/rdkit,rdkit/rdkit,adalke/rdkit,rdkit/rdkit,adalke/rdkit,bp-kelley/rdkit,ptosco/rdkit,rvianello/rdkit,rvianello/rdkit,ptosco/rdkit,jandom/rdkit,rdkit/rdkit,bp-kelley/rdkit,rvianello/rdkit,bp-kelley/rdkit,rdkit/rdkit,adalke/rdkit,adalke/rdkit,rdkit/rdkit,rvianello/rdkit,rvianello/rdkit,rvianello/rdkit,ptosco/rdkit,rvianello/rdkit,greglandrum/rdkit,greglandrum/rdkit,bp-kelley/rdkit,ptosco/rdkit,adalke/rdkit,jandom/rdkit,ptosco/rdkit,jandom/rdkit,jandom/rdkit,adalke/rdkit,greglandrum/rdkit,bp-kelley/rdkit,ptosco/rdkit,adalke/rdkit,ptosco/rdkit,adalke/rdkit,rvianello/rdkit,jandom/rdkit,jandom/rdkit,greglandrum/rdkit,rdkit/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,greglandrum/rdkit,greglandrum/rdkit,jandom/rdkit,rdkit/rdkit,greglandrum/rdkit,jandom/rdkit,rdkit/rdkit,ptosco/rdkit