REST - Bean index and retrieve returns response with HttpCode:200 and body:null after the second call

Bean index and retrieve operations returns response with HttpCode:200 and body:null after the second call

Pre-conditions:
- Enable index and retrieve for bean resource in service configuration

Steps to reproduce (index):
1. First call GET /restapi/bean - returns list of existing beans
2. Second and following calls GET /restapi/bean - returns 200:null

The same behavior for retrieve operation.

Report message:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'bean_services_index' not found or invalid function name in _services_controller_execute_internals() (line 203 of /mnt/www/html/jnjbosdev/docroot/profiles/jjbos/modules/contrib/services/includes/services.runtime.inc).