Parse for async nodes based on node name

Author: AndyZe

src/xml_parsing.cpp

@@ -546,8 +546,11 @@ void VerifyXML(const std::string& xml_text,
           const std::string child_name = node->FirstChildElement()->Name();
           const auto child_search = registered_nodes.find(child_name);
           auto child_type = child_search->second;
-          // TODO: what this really needs to check is if the child is async
-          if (child_type != NodeType::CONDITION)
+          if (child_type == NodeType::CONTROL &&
+              ((child_name == "ThreadedAction") ||
+              (child_name == "StatefulActionNode") ||
+              (child_name == "CoroActionNode"))
+             )
           {
             ThrowError(line_number,
                       std::string("The first child of a ReactiveSequence cannot be asynchronous"));