fix: Fix _get_accelerator_memory#44
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Issue #, if available:
Description of changes:
Fix _get_accelerator_memory in test/distributed/tensor/debug/test_debug_mode.py to handle cases where no accelerator is available or the accelerator backend doesn't support mem_get_info. Adds early-return guards that:
Returns 0 in both cases, which allows the test to be properly skipped on unsupported backends (e.g., PrivateUse1 devices).
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