Instantiate new topic data for cache (#75)

Signed-off-by: Yadunund <[email protected]>

rmw_zenoh_cpp/src/detail/graph_cache.cpp

@@ -115,7 +115,13 @@ void GraphCache::parse_put(const std::string & keyexpr)
       GraphNode::TopicMap::iterator cache_topic_it = graph_topics_.find(topic_info.name_);
       if (cache_topic_it == graph_topics_.end()) {
         // First time this topic name is added to the graph.
-        graph_topics_[topic_info.name_] = std::move(topic_data_map);
+        std::shared_ptr<TopicData> topic_data_ptr = std::make_shared<TopicData>(
+          topic_info,
+          TopicStats{pub_count, sub_count}
+        );
+        graph_topics_[topic_info.name_] = GraphNode::TopicDataMap{
+          {topic_info.type_, topic_data_ptr}
+        };
       } else {
         // If a TopicData entry for the same type exists in the topic map, update pub/sub counts
         // or else create an new TopicData.