Notification API correctly handles invalid resources

app/Http/Controllers/Api/Web/NotificationsController.php

@@ -42,7 +42,9 @@ class NotificationsController extends ApiControllerBase
             ->take(20)
             ->get();
 
-        return ['notifications' => $notifications->toArray()];
+        $outputArray = $notifications->toArray();
+
+        return ['notifications' => array_values(array_filter($outputArray))];
     }
 
     /**

app/Models/Activity.php

@@ -151,9 +151,6 @@ class Activity extends Model {
 
     public function getThumbnailUrlAttribute()
     {
-        if (is_null($this->resource))
-            return "/images/icons/profile_small.png";
-
         switch ($this->resource_type) {
             case User::class:
                 return $this->resource->getAvatarUrl(Image::THUMBNAIL);
@@ -172,6 +169,7 @@ class Activity extends Model {
     }
 
     public function getTitleFromActivityType() {
+
         switch($this->activity_type) {
             case static::TYPE_PUBLISHED_TRACK:
                 return "Pony.fm - New track";

app/Models/Notification.php

@@ -76,6 +76,10 @@ class Notification extends Model {
     }
 
     public function toArray() {
+        if (is_null($this->activity->resource)) {
+            return '';
+        }
+
         return [
             'id'            => $this->id,
             'date'          => $this->activity->created_at->toAtomString(),