propelorm/Propel — pull request #380 by VincentChalnot (2012-06-12 14:22:46+00:00)
Title: Preventing exception at runtime when getting TableMap of foreign key in ColumnMap

As seen with Willdurand in the following discussion:
https://github.com/propelorm/Propel/commit/e17d34bc563230793bf0d138849febcc6cbfdd19#commitcomment-1445920
See commit for more details