fixing the messaging models to not fail in trying to cast a datetime that already is a datetime (instead of a string) to a datetime.
fixing the messaging models to not fail in trying to cast a datetime
that already is a datetime (instead of a string) to a datetime.

caktus/rapidsms,ehealthafrica-ci/rapidsms,unicefuganda/edtrac,peterayeni/rapidsms,catalpainternational/rapidsms,ehealthafrica-ci/rapidsms,lsgunth/rapidsms,eHealthAfrica/rapidsms,ken-muturi/rapidsms,eHealthAfrica/rapidsms,catalpainternational/rapidsms,eHealthAfrica/rapidsms,caktus/rapidsms,dimagi/rapidsms,peterayeni/rapidsms,dimagi/rapidsms,peterayeni/rapidsms,unicefuganda/edtrac,ken-muturi/rapidsms,lsgunth/rapidsms,ken-muturi/rapidsms,lsgunth/rapidsms,unicefuganda/edtrac,catalpainternational/rapidsms,caktus/rapidsms,ehealthafrica-ci/rapidsms,catalpainternational/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms