fix(ui): main popup now shows 0 for empty schedule (#395)

src/pages/background/background.ts

@@ -59,15 +59,11 @@ messageListener.listen();
 UserScheduleStore.listen('schedules', async schedules => {
     const index = await UserScheduleStore.get('activeIndex');
     const numCourses = schedules.newValue[index]?.courses?.length;
-    if (!numCourses) return;
-
-    updateBadgeText(numCourses);
+    updateBadgeText(numCourses || 0);
 });
 
 UserScheduleStore.listen('activeIndex', async ({ newValue }) => {
     const schedules = await UserScheduleStore.get('schedules');
     const numCourses = schedules[newValue]?.courses?.length;
-    if (!numCourses) return;
-
-    updateBadgeText(numCourses);
+    updateBadgeText(numCourses || 0);
 });

src/shared/util/updateBadgeText.ts

@@ -14,7 +14,7 @@ export const BADGE_LIMIT = 10;
  */
 export default function updateBadgeText(value: number): void {
     let badgeText = '';
-    if (value > 0) {
+    if (value >= 0) {
         if (value > BADGE_LIMIT) {
             badgeText = `${BADGE_LIMIT}+`;
         } else {