Small bug that occurs as groups are created

Hello,

Trying out the simple access module. Very nice work.

I received the following php error message:
implode(): Bad arguments. in simple_access.module on line 217.

I received this error message after creating groups (at ?q=admin/access/simple_access/add) -- I only got this error message if I didn't assign any roles to the group immediately as I created it.

If I created a group and assigned a role into it, I did not receive the error message.

From looking at the code, it appears that the error occurs when the list of groups is generated. If there is no value for roles, it throws an exception. I am not a programmer, but it looks like if the $r value in line 217 is null, the error message is generated.

This bug doesn't appear to affect any functionality, and it is pretty minor as it only seems to appear when the site admin is configuring groups incorrectly :) -- ie, not assigning any roles to a group.

I am running Apache 2.0, PHP 4.3.1, MySQL 4.1.8 in Windows XP.

Cheers,

bonobo