se-edu / addressbook-level4 / 4013

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Pull #805

travis-ci

UniquePersonList: refactor verbose loop in setPersons

The for loop in UniquePersonList#setPersons is verbose.

Since lambda expression cannot handle exceptions, this loop cannot be 
replaced by a lambda expression and needs to be simplified instead.

Let's replace this for loop with 
CollectionUtil#elementsAreUnique(Collection<?>).

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