Fix Orb of Rebirth purchase race condition

Await genericPurchase completion before page reload to prevent request cancellation.

Also adds defensive check for undefined error.response in axios interceptor to prevent "t.response undefined" errors.

website/client/src/app.vue

@@ -208,6 +208,9 @@ export default {
 
       return response;
     }, error => { // Set up Error interceptors
+      if (!error.response) {
+        return Promise.reject(error);
+      }
       if (error.response.status >= 400) {
         const isBanned = this.checkForBannedUser(error);
         if (isBanned === true) return null; // eslint-disable-line consistent-return

website/client/src/components/shops/buyModal.vue

@@ -851,7 +851,7 @@ export default {
           return;
         }
         if (this.genericPurchase) {
-          this.makeGenericPurchase(this.item, 'buyModal', this.selectedAmountToBuy);
+          await this.makeGenericPurchase(this.item, 'buyModal', this.selectedAmountToBuy);
           await this.purchased(this.item.text);
         }
       }