message: Fix console error when topic or tables were subscribed to something
  other than functions
diff: @@ -264,15 +264,13 @@ export function useStacks() {
  if (!construct.data.consumer) return [];
  return [[construct.data.consumer.node, construct]];
  case "Table":
  - return construct.data.consumers.map((c) => [
  - c.fn!.node,
  - construct,
  - ]);
  + return construct.data.consumers
  + .filter((r) => r.fn)
  + .map((c) => [c.fn!.node, construct]);
  case "Topic":
  - return construct.data.subscribers.map((fn) => [
  - fn!.node,
  - construct,
  - ]);
  + return construct.data.subscribers
  + .filter((r) => r.fn)
  + .map((fn) => [fn!.node, construct]);
  default:
  return [];
  }
  