FD3-744 update método entidad onu

src/FTTHBundle/Entity/ONU.php

@@ -1036,7 +1036,7 @@ class ONU implements DeviceInterface, TenancyIdTraitInterface, LocationInterface
     {
         return implode(',', array_map(function($servicePort) {
             return $servicePort->getNumber();
-        }, $this->servicePorts));
+        }, $this->servicePorts->toArray()));
     }
 
 }