Minor function simplification in private function

[eileenmcnaughton]

Overview

Minor function simplification in private function

Before

Function checks for duplicates & early-returns if they are found

After

Parent checks for duplicates & calls function if they are not found

Technical details

The function does 2 different things depending on whether if finds a duplicate
& having it in a sub-function doesn't make the parent class clearer....

[civibot]

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[colemanw]

Refactor makes sense