This module provides a migration processing plugin that will allow you to set a fields default value ONLY if a value does not already exist on the destination node.

One problem we encountered at OHSU was that while we wanted a "default_value" for a particular field, it was aggressively setting that default value if we ever ran a migration with the update flag.

We were unable through searching to determine a way to use core migrate or migrate plus to accomplish this task, and so this module has come to exist.

Usage Use: