Adding an empty state UI for the printer search activity in the spooler.

The user can select all printers from the print dropdown to get to
a search for printers activity where one can filter out the list
of a available printers. We did not have an empty state UI for the
case when the query yields no printers.

bug:11009053

Change-Id: I6b45517b8a7b319992019a1bf65858319a19a0de