Fix a bug

paddle/framework/op_registry.h

@@ -222,6 +222,9 @@ class OpRegistry {
         varmap[var.name()] = idx++;
       }
       // ================================================ //
+    } else {
+      op_info.proto_ = nullptr;
+      op_info.checker_ = nullptr;
     }
     op_info_map().insert(std::make_pair(op_type, op_info));
     // register gradient op

paddle/framework/pybind.cc

@@ -176,6 +176,9 @@ All parameter, weight, gradient are variables in Paddle.
     std::vector<py::bytes> ret_values;
     for (auto it = op_info_map.begin(); it != op_info_map.end(); ++it) {
       const OpProto *proto = it->second.proto_;
+      if (proto == nullptr) {
+        continue;
+      }
       PADDLE_ENFORCE(proto->IsInitialized(), "OpProto must all be initialized");
       std::string str;
       PADDLE_ENFORCE(proto->SerializeToString(&str),