Fixed: Customer search during ticket creation - OTRS shows details also if no customer match the search (bug#10222).
Squashed commit of the following:

commit a098f3d99b847d5338a0ec3ae1ec2d7748e91578
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Feb 4 23:47:16 2014 +0100

    [Bug 10222] Customer search during ticket creation - OTRS shows details also if no customer match the search

    Deleted default value for parameter CustomerUserID in function GetCustomerInfo