doctrine/phpcr-odm — pull request #175 by simensen (2012-09-12 01:38:20+00:00)
Title: targetDocument is not always available.

The [documentation](http://docs.doctrine-project.org/projects/doctrine-phpcr-odm/en/latest/reference/association-mapping.html#reference-other-documents) implied that `targetDocument` was optional but this was causing an undefined index notice when `targetDocument` is not specified.