patch for fetch uploadFile task and notification to properly get error

addon/services/fetch.js

@@ -548,14 +548,18 @@ export default class FetchService extends Service {
                     this.notifications.serverError(error, 'File upload failed.');
                 });
 
-            const model = this.store.push(this.store.normalize('file', upload.file));
-            set(file, 'model', model);
+            if (upload) {
+                const model = this.store.push(this.store.normalize('file', upload.file));
+                set(file, 'model', model);
 
-            if (typeof callback === 'function') {
-                callback(model);
+                if (typeof callback === 'function') {
+                    callback(model);
+                }
+
+                return model;
             }
 
-            return model;
+            return null;
         } catch (error) {
             queue.remove(file);
             this.notifications.serverError(error, 'File upload failed.');

addon/services/notifications.js

@@ -16,7 +16,11 @@ export default class NotificationsService extends EmberNotificationsService {
             return this.error(errorMessage, options);
         }
 
-        return this.error(error ?? fallbackMessage, options);
+        if (typeof error === 'string') {
+            return this.error(error, options);
+        }
+
+        return this.error(fallbackMessage, options);
     }
 
     invoke(type, message, ...params) {

addon/utils/get-resource-name-from-transition.js

@@ -1,10 +1,16 @@
-export default function getResourceNameFromTransition(transition) {
+import humanize from './humanize';
+
+export default function getResourceNameFromTransition(transition, options = {}) {
     const { to } = transition;
 
     if (typeof to.name === 'string') {
         let routePathSegments = to.name.split('.');
         let resourceName = routePathSegments[3];
 
+        if (options.humanize === true) {
+            return humanize(resouceName);
+        }
+
         return resourceName;
     }