#14 strip out null values in model toArray

the POST bulletintags endpoint of the api does not like getting id:null, other endpoints ignore it

Author: sethphillips

src/Models/CarouselModel.php

@@ -107,6 +107,9 @@ public function toArray()
       ->map(function($property){
         return $this->flattenRelationships($property);
       })
+      ->reject(function($property){
+        return is_null($property);
+      })
       ->toArray();
 
     return $properties;