Fix

tools/pnnx/src/load_torchscript.cpp

@@ -690,9 +690,8 @@ int load_torchscript(const std::string& ptpath, Graph& pnnx_graph,
             input_tensors2.push_back(t);
         }
     }
-    else
+    else if(input_shapes2.size() != 0)
     {
-        std::vector<at::Tensor> input_tensors2;
         for (size_t i = 0; i < input_shapes2.size(); i++)
         {
             const std::vector<int64_t>& shape = input_shapes2[i];