Use default value if segment is set but is empty

This is usefull if a key segment is defined but is empty. So Array helper will return default value;

// Returns default "id" if no order_by parameter is defined in "GET" url parameters
Arr::get($my_get_url_parameters, 'order_by', 'id', true);

// Returns default "desc" if no order_by parameter is defined in "GET" url parameters
Arr::get($my_get_url_parameters, 'order', 'desc', true);