refactor: simplify pull queue admission

frontend/week-plan.js

@@ -529,8 +529,7 @@ function createWeekPlan({fetchJson,localDate,timeZone,storage,getLogin,now=()=>D
   }
   function flushPull() {
     if(pulling)return pulling;
-    const record=pendingPull(),key=pullKey();
-    if(!record||!key)return Promise.resolve(false);
+    if(!pendingPull()||!pullKey())return Promise.resolve(false);
     pulling=(async()=>{
       let result,lastResult=false;
       while(pendingPull()){