Enhance error message when x or y is empty in elementwise_op (#33928)

* enhance error message when x or y is empty in elementwise_op

* format code

* format code

paddle/fluid/operators/elementwise/elementwise_op_function.h

@@ -252,6 +252,10 @@ void CommonForwardBroadcastCPU(const framework::Tensor *x,
   std::vector<int> index_array(max_dim, 0);
   const T *x_data = x->data<T>();
   const T *y_data = y->data<T>();
+  PADDLE_ENFORCE_NOT_NULL(x_data, platform::errors::InvalidArgument(
+                                      "The input X should not be empty."));
+  PADDLE_ENFORCE_NOT_NULL(y_data, platform::errors::InvalidArgument(
+                                      "The input Y should not be empty."));
   OutType *out_data = z->mutable_data<OutType>(ctx.GetPlace());
 
   const int out_size = std::accumulate(out_dims_array, out_dims_array + max_dim,