tree e77bb15dd53c615b055991e212f52288f9c93274
parent f097a5d38b1f099285642ebaafd929d7cc909f72
author David Pursehouse <dpursehouse@collab.net> 1541900340 +0900
committer David Pursehouse <dpursehouse@collab.net> 1542208675 +0000

ContributorAgreementsChecker: Use Java's Objects.requireNonNull

Usage of Preconditions.checkNotNull was replaced with the Java API
in change I1d4a6b342e, but this one was either missed or added later.

Change-Id: I93ec9f3077bbda3737d995032a458e1337abba52