Import with an empty employee generates an error

When you import individuals with an employer and choose "employee of" "Organization Name" for the employer name, it generates an error message about a mandatory missing field in the related contact when the employer field is empty.

This looks scary but is not actually an error: if you have the field employee empty, it shouldn't try to create the organization, and shouldn't be generating an error.

Expected behaviour:
silently ignore the empty field and keep importing without any error. This was how it was working previously (3.1 at least).

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