Make sure the status code is actually returned

fetch-mixin.js

@@ -25,6 +25,7 @@ export const fetchMixin = function(superClass) {
         this.__abortControllers.set(`${method}:${url}`, ac);
       }
 
+      let statusCode = null;
       try {
         const reqOptions = {
           method,
@@ -46,6 +47,7 @@ export const fetchMixin = function(superClass) {
           console.error(resp);
         }
 
+        statusCode = resp.status;
         if (resp.status !== 200) {
           document.dispatchEvent(new CustomEvent('request-error', { detail: resp, bubbles: true, composed: true }));
         }
@@ -56,7 +58,7 @@ export const fetchMixin = function(superClass) {
           return { statusCode: -1, error: err };
         } else {
           this.__abortControllers.delete(`${method}:${url}`);
-          return { statusCode: null, error: err };
+          return { statusCode, error: err };
         }
       }
     }