fix: /stats now uses double hyphens like /today for WN8

src/commands/stats.tsx

@@ -78,6 +78,8 @@ export default {
         0,
       );
 
+      let hasWN8AccumulatedAtAll = false;
+
       supplementaryStats = {
         tier:
           entries.reduce((accumulator, [tankIdString, stats]) => {
@@ -93,11 +95,14 @@ export default {
             // edge case where new tanks don't have averages
             if (tankAverages[tankId]) {
               const tankWN8 = getWN8(tankAverages[tankId].all, stats);
+              hasWN8AccumulatedAtAll = true;
               return accumulator + tankWN8 * stats.battles;
             } else return accumulator;
           }, 0) / totalBattles,
       };
 
+      if (!hasWN8AccumulatedAtAll) supplementaryStats.WN8 = undefined;
+
       stats = sumStats(entries.map(([, stats]) => stats));
     }