Column Relationship +
Merge pull request #468 from WellingGuzman/error-500-and-friends

Column Relationship +
prevent error on new M2M item
check for all relationship fields
Merge pull request #471 from WellingGuzman/issue-470

prevent error on new M2M item
Merge pull request #472 from WellingGuzman/issue-469

check for all relationship fields