Update BaseApiResource.php

7.2PHP count warning if return Object and not Collection

src/Http/Resources/BaseApiResource.php

@@ -165,7 +165,7 @@ protected function relationships()
             }
 
             $data = $this->resource->$relationship;
-            if (0 == count($data)) {
+            if ($data instanceof Countable && 0 == count($data)) {
                 continue;
             }