Correctly set output_size when hidden_cell=None #109

Job	Run time
static	1m 0s
static	1m 0s
test (test, gpu, tensorflow[and-cuda], self-hosted, gpu)	8m 55s
test (test, gpu, tensorflow[and-cuda], self-hosted, gpu)	8m 55s
test (test, 3.11, latest)	2m 30s
test (test, 3.11, latest)	2m 30s
test (test, tensorflow~=2.6.0, 3.8, oldest)	2m 14s
test (test, tensorflow~=2.6.0, 3.8, oldest)	2m 14s
test (test, tensorflow~=2.9.0, tf-2.9)	2m 12s
test (test, tensorflow~=2.9.0, tf-2.9)	2m 12s
test (test, tensorflow~=2.13.0, tf-2.13)	2m 15s
test (test, tensorflow~=2.13.0, tf-2.13)	2m 16s
test (docs, tensorflow[and-cuda]==2.16.1, 3.9, self-hosted, gpu)	4m 10s
test (docs, tensorflow[and-cuda]==2.16.1, 3.9, self-hosted, gpu)	4m 10s
test (examples, tensorflow[and-cuda]==2.16.1, self-hosted, gpu)	5m 24s
test (examples, tensorflow[and-cuda]==2.16.1, self-hosted, gpu)	5m 24s
coverage	19s
coverage	15s
deploy	0s
deploy	0s
	57m 55s

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