throw sensible exceptions from the gasteiger param code (part of #485)
throw sensible exceptions from the gasteiger param code (part of #485)

adalke/rdkit,soerendip42/rdkit,rvianello/rdkit,rvianello/rdkit,rvianello/rdkit,greglandrum/rdkit,soerendip42/rdkit,ptosco/rdkit,greglandrum/rdkit,strets123/rdkit,greglandrum/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,rdkit/rdkit,strets123/rdkit,greglandrum/rdkit,jandom/rdkit,bp-kelley/rdkit,rvianello/rdkit,soerendip42/rdkit,greglandrum/rdkit,rdkit/rdkit,jandom/rdkit,soerendip42/rdkit,strets123/rdkit,bp-kelley/rdkit,rvianello/rdkit,soerendip42/rdkit,adalke/rdkit,rdkit/rdkit,strets123/rdkit,adalke/rdkit,strets123/rdkit,ptosco/rdkit,bp-kelley/rdkit,soerendip42/rdkit,rdkit/rdkit,ptosco/rdkit,adalke/rdkit,ptosco/rdkit,greglandrum/rdkit,bp-kelley/rdkit,adalke/rdkit,rvianello/rdkit,soerendip42/rdkit,strets123/rdkit,ptosco/rdkit,jandom/rdkit,jandom/rdkit,rdkit/rdkit,soerendip42/rdkit,strets123/rdkit,adalke/rdkit,rdkit/rdkit,greglandrum/rdkit,jandom/rdkit,jandom/rdkit,bp-kelley/rdkit,rdkit/rdkit,greglandrum/rdkit,adalke/rdkit,rvianello/rdkit,strets123/rdkit,jandom/rdkit,jandom/rdkit,ptosco/rdkit,bp-kelley/rdkit,rvianello/rdkit,adalke/rdkit,ptosco/rdkit,ptosco/rdkit,rdkit/rdkit