Bux fix for:

Separate Pricing Per Customer v.4.1.5 (build 051113) 9 Jul 2006 package

This is a small bug fix for admin/categories.php. I noticed that if you copy a product as a duplicate and do not have an existing group price, a group price for the default group (i.e. customers_group_id=0) will be created anyway. This small modification prevents that to happen. Hope this helps someone. Please, comment at the forums. Includes only the bug fix.

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