fix: handle remote prices.tf error in background script

src/background/background.ts

@@ -78,6 +78,9 @@ async function priceUsingPricesTF(token: string, sku: string, retries: number =
       throw new Error(`Cloudflare rate limit exceeded, stopping`)
     }
   }
+  if (!response.ok) {
+    throw new Error(`Pricing request for ${sku} failed with status code: ${response.status}`);
+  }
   const data = await response.json();
   const prices = new PricesResponse();
   prices.keys = data['sellKeys']
@@ -100,7 +103,8 @@ chrome.runtime.onMessage.addListener(
           priceUsingPricesTF(token, sku)
           .then((response) => sendResponse(response))
           .catch(error => {
-            sendResponse(error);
+            console.error(`Received "${error}" error while pricing ${sku} using prices.tf`)
+            sendResponse(null);
             return false;
           })
         }