fixing experimental test

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Author: HDCharles

torchao/dtypes/uintx/packed_linear_int8_dynamic_activation_intx_weight_layout.py

@@ -359,6 +359,9 @@ def _impl_2d_aten(input_tensor, weight_tensor):
 
         m, k = input_tensor.shape
         n, k_ = weight_tensor.shape
+        if m==0: # handling for empty input
+            return input_tensor
+
         assert k_ == k
         group_size = weight_tensor.tensor_impl.get_layout().group_size
         packed_weight = weight_tensor.tensor_impl.packed_weight