Correctly set output_size when hidden_cell=None #114

Job	Run time
static	1m 6s
static	1m 6s
test (test, gpu, tensorflow[and-cuda], self-hosted, gpu)	3m 5s
test (test, gpu, tensorflow[and-cuda], self-hosted, gpu)	3m 5s
test (test, 3.11, latest)	2m 20s
test (test, 3.11, latest)	2m 20s
test (test, tensorflow~=2.6.0, 3.8, oldest)	2m 18s
test (test, tensorflow~=2.6.0, 3.8, oldest)	2m 18s
test (test, tensorflow~=2.9.0, tf-2.9)	1m 35s
test (test, tensorflow~=2.9.0, tf-2.9)	1m 35s
test (test, tensorflow~=2.13.0, tf-2.13)	2m 42s
test (test, tensorflow~=2.13.0, tf-2.13)	2m 42s
test (docs, tensorflow[and-cuda]==2.16.1, 3.9, self-hosted, gpu)	3m 46s
test (docs, tensorflow[and-cuda]==2.16.1, 3.9, self-hosted, gpu)	4m 41s
test (examples, tensorflow[and-cuda]==2.16.1, self-hosted, gpu)	2m 42s
test (examples, tensorflow[and-cuda]==2.16.1, self-hosted, gpu)	2m 42s
coverage	19s
coverage	24s
deploy	0s
deploy	0s
	40m 46s

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