check num of proxy args

there are some ops, mainly factory ops like `torch.empty`, that do not take any tensor
proxies as their args/kwargs.

Signed-off-by: Masaki Kozuki <mkozuki@nvidia.com>

thunder/core/transform_common.py

@@ -415,6 +415,9 @@ def has_tag(bsym: BoundSymbol, tag: prims.OpTags) -> bool:
         if in_tensor in trace_args_set:
             continue
         prod_bsym: BoundSymbol = producer_bsyms[in_tensor]
+        if not prod_bsym.flat_proxy_args:
+            # assuming `prod_bsym` is a tensor factory method such as `torch.empty`, `torch.zeros`, and `torch.ones`
+            continue
         orig_tensor = prod_bsym.flat_proxy_args[0]
         consumer_of_orig_tensor = consumers[orig_tensor]
         # When the orig tensor is not used by consumers other than `prod_bsym`, it'd be safe.