Empty fields cause error "Unable to handle the provided embed string or URL."

Not a huge issue--and I am aware that empty-fields handling is a hot topic in feeds in general--but when I import a CSV that has some media_internet target fields with no source values, my screen prints:

Unable to handle the provided embed string or URL.

It prints the message 1 time for every item that has an empy source field for the media_internet target (which can be a lot if the csv contains 1000 rows!). Items seem to import fine. I just noticed it after moving from 7.x-2.0-alpha1 to 7.x2.x-dev.