Not necessary to show client category if it is empty

If client category is empty, it is not necessary to show
the search combo box on sales wizard.

fixes: http://bugs.async.com.br/show_bug.cgi?id=5493

Change-Id: I6e57809a80d31edb7747cf89b23d0f9844289bd9
Merge "Not necessary to show client category if it is empty"