i am trying to show wordpress registered users role like - subscriber, author, editor etc.

into comment page of wordpress. 

for that i created this code

```
<?php //get the commented user id
$user_id   = get_comment(get_comment_ID())->user_id;

if ($user_id)
{
    $user_info = get_userdata($user_id );
    echo implode(', ', $user_info->roles) ;
} ?>

```

it is working fine for me 

If commentator's name is KING KHAN and he is subscriber then it shows 

KING KHAN [subscriber]

but if the user is being deleted then into the comment page in comment of that user it shows

***KING KHAN[ Warning: implode(): Invalid arguments passed in /home/USERACCOUNT/public\_html/wp-includes/class-walker-comment.php on line 277]***

Here instead of this i want to show

***KING KHAN[Member Deleted]***

please edit above code for this