fix: avoid IndexError in BF16_Optimizer.destroy() when using DummyOptim #7763
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fix: avoid IndexError in BF16_Optimizer.destroy() when using DummyOptim
Short-circuit BF16_Optimizer.destroy() if using_real_optimizer is False.
When initialized with optimizer=None (DummyOptim), bf16_groups remains empty, causing an IndexError when accessing it in destroy().
Resolves #7752