fix(overmind-react): avoid added a flush listener when no paths are tracked

Author: garth

packages/node_modules/overmind-react/src/index.ts

@@ -74,7 +74,7 @@ export const createHook = <A extends Overmind<Configuration>>(overmind: A) => {
     useEffect(() => {
       const paths = overmind.clearTrackState(trackId)
 
-      if (paths) {
+      if (paths && paths.size) {
         const listener = overmind.addFlushListener(paths, (flushId) => {
           forceUpdate(flushId)
           overmind.eventHub.emitAsync(EventType.COMPONENT_UPDATE, {