fix bug of building InferMetaContext (#42211)

paddle/fluid/framework/infershape_utils.cc

@@ -558,10 +558,7 @@ CompatInferMetaContext BuildInferMetaContext(InferShapeContext* ctx,
               }
 
               if (num_ele <= 0) {
-                PADDLE_THROW(platform::errors::Unimplemented(
-                    "Invalid number for construct phi::IntArray, expected "
-                    "number > 0, but actually is %d. ",
-                    num_ele));
+                num_ele = tensor_dims.size();
               }
 
             } else {