Merge pull request #1 from ThePotatoGuy/master

Fixed NullPointer Issue
Merge pull request #2 from ThePotatoGuy/master

fixed the outofboudsexception
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addAchaemenid() returns a nullPointerException. This results in the size
of the PoliticalUnits array to be 0, thus causing the indexOf method to
return -1 and therefore returning an outofbounds exception.