Ruby

Don't connect DummyNilNode when there's no else clause #1076

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (3.2)	40s
build (3.3)	43s
build (3.4)	36s
build (head)	40s
build (truffleruby)	29s
build (truffleruby-head)	32s
	3m 44s

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