Add null guard for AddCommentToMethod and NumberToDuration #3132

Job	Run time
check-s3-related-changes	1m 1s
s3-regression-tests-upload-multi	4m 53s
s3-regression-tests-upload-crt	4m 52s
s3-regression-tests-control-plane	4m 21s
s3-regression-tests-upload-async	5m 23s
s3-regression-tests-download	2m 30s
s3-regression-tests-upload-sync	5m 22s
	28m 22s

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