Move more NilClass methods to ruby #622

Job	Run time
omnibus compilations, trigger	2s
omnibus compilations, #1	28m 19s
omnibus compilations, #2	31m 55s
omnibus compilations, #3	29m 54s
omnibus compilations, #7	32m 15s
omnibus compilations, #4	25m 8s
omnibus compilations, #8	26m 14s
omnibus compilations, #10	26m 31s
omnibus compilations, #9	26m 45s
omnibus compilations, #5	26m 8s
omnibus compilations, #11	27m 23s
omnibus compilations, #6	26m 58s
omnibus compilations, #12	24m 0s
omnibus compilations, result	4s
	5h 31m 36s

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