Do not disable the add printer icon and have special empty view if no

print services are enabled

The add printer icon is always visible as this is used for both adding
a printer and adding addition print services

We have three different empty views now:
1. No print services
2. No printers found (not search filter set)
3. No printers found (search filter set)

Bug: 24132367
Change-Id: Ic30812b60986f1e0f023488cefc6aa901ce20824