remove 0 calibers from graph

frontend/src/pages/Home.tsx

@@ -299,18 +299,20 @@ export default function Home() {
     [ammoPageCaliberIds, enabledCalibers],
   );
   const ammoChartData = useMemo(() => {
-    const sortedInventory = [...enabledAmmoInventory].sort((left, right) => {
+    const withRounds = enabledAmmoInventory
+      .filter((inventory) => inventory.roundsOnHand > 0)
+      .sort((left, right) => {
         if (right.roundsOnHand !== left.roundsOnHand) {
           return right.roundsOnHand - left.roundsOnHand;
         }
 
         return left.caliber.localeCompare(right.caliber);
       });
-    const maxRounds = sortedInventory[0]?.roundsOnHand ?? 0;
+    const maxRounds = withRounds[0]?.roundsOnHand ?? 0;
 
-    return sortedInventory.map((inventory) => ({
+    return withRounds.map((inventory) => ({
       ...inventory,
-      widthPercent: maxRounds > 0 ? Math.max((inventory.roundsOnHand / maxRounds) * 100, inventory.roundsOnHand > 0 ? 8 : 0) : 0,
+      widthPercent: maxRounds > 0 ? Math.max((inventory.roundsOnHand / maxRounds) * 100, 8) : 0,
     }));
   }, [enabledAmmoInventory]);
   const firearmCategoryCounts = useMemo(
@@ -1295,7 +1297,7 @@ export default function Home() {
               </div>
 
               {ammoChartData.length === 0 ? (
-                <p className="placeholder-copy">Enable calibers in Settings to see your ammo inventory chart.</p>
+                <p className="placeholder-copy">Add rounds to a caliber to see how your inventory stacks up.</p>
               ) : (
                 <div className="ammo-chart">
                   {ammoChartData.map((inventory) => (