[Bug] iterating node got error after convert to gs.nx graph

[acezen]

Discussed in https://github.com/alibaba/GraphScope/discussions/3225

^{Originally posted by zjarles September 16, 2023} 将子图转换为networks图后，在循环遍历时，报错如下，请问是什么原因呢？

G = nx.DiGraph(sub_graph, default_label="trmnl")
for node in G.nodes(data=True):
print(node)

AnalyticalEngineInternalError: /work/analytical_engine/core/object/object_manager.h:80: GetObject -> Object graph_GWXIIwo7 does not exist boost::leaf::result<std::shared_ptrgs::IFragmentWrapper > gs::ObjectManager::GetObjectgs::IFragmentWrapper(std::string const&) + 0x2FE gs::GrapeI ... [truncated]

这个图是存在的，sub_graph.schema可以显示数据。

[github-actions[bot]]

/cc @acezen, this issus/pr has had no activity for for a long time, could you folks help to review the status ? To suppress further notifications,

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