[dtensor] account for empty list when turning to OpStrategy

[wanchaol]

Stack from ghstack (oldest at bottom):

• [dtensor] enable radam foreach optimizer #115566
• [dtensor] add test for nadam optimizer #115565
• [dtensor] enable adadelta foreach optimizer #115564
• [dtensor] add a implicit replication flag #115297
• -> [dtensor] account for empty list when turning to OpStrategy #115298

Trying to fix #115065

cc @mrshenli @pritamdamania87 @zhaojuanmao @satgera @rohan-varma @gqchen @aazzolini @osalpekar @jiayisuse @H-Huang @kwen2501 @awgu @penguinwu @fegin @XilunWu @fduwjj @wz337 @tianyu-l @wconstab @yf225 @kiukchung @LucasLLC

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 4d8447e with merge base da341d0 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• inductor-periodic / cuda12.1-py3.10-gcc9-sm86-periodic-dynamo-benchmarks / test (dynamic_aot_eager_torchbench, 1, 2, linux.g5.4xlarge.nvidia.gpu) (gh)

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[XilunWu]

I'm curious of weather this empty list in the original issue comes from a op that has no return value or the return value is a list of optional objects?

[wanchaol]

I'm curious of weather this empty list in the original issue comes from a op that has no return value or the return value is a list of optional objects?

the issue mentioned that there's one argument that is a list[int] but it's a empty list when passing in, therefore erroring out

[wanchaol]

@pytorchbot merge

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