修复管网计算的bug

src/affected_space/function.py

@@ -1081,6 +1081,7 @@ try:
             g = graph_model.FloorGraph(model, system_name, domain, floor_connectors, floor_elements)
             plpy.info("reached")
             g.get_floor_graphs()
+            g.combine_single_model()
             floorgraphs.append(g)
         projectgraph = graph_model.combine_systemgraph(project_id, floorgraphs)