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The file +/- computation in the function that generates the email message text expects there to be files present in the git/gerrit commit object. But for merge commits there are no files present in the merge commit itself. A max() function ended up getting an empty list as an argument and then caused a crash. Fix this by checking to make sure there's actually files present in this list before passing it on to max(). If there are no files then just continue. Change-Id: Icd74234676ff3be6edb7fe65913970fd7a0aaff1 Signed-off-by: Alex Waterman <alexw@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/2226035 Reviewed-by: Thomas Fleury <tfleury@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>