Puddles & spreader refactor (#15191)

Content.Server/NodeContainer/EntitySystems/NodeGroupSystem.cs

@@ -345,7 +345,7 @@ namespace Content.Server.NodeContainer.EntitySystems
             _mapManager.TryGetGrid(xform.GridUid, out var grid);
 
             if (!node.Connectable(EntityManager, xform))
-                    yield break;
+                yield break;
 
             foreach (var reachable in node.GetReachableNodes(xform, nodeQuery, xformQuery, grid, EntityManager))
             {

Content.Server/NodeContainer/NodeGroups/NodeGroupFactory.cs

@@ -59,6 +59,7 @@ namespace Content.Server.NodeContainer.NodeGroups
         Apc,
         AMEngine,
         Pipe,
-        WireNet
+        WireNet,
+        Spreader,
     }
 }