Bug 6269 - can't undefine a printer profile

Bug 6269 - can't undefine a printer profile

This patch adds a 'No Profile/N/A' selection to the printer profile
drop-down menu along with code to handle the selection of it. This
selection is the default selection for new templates.

Documentation should be updated to reflect this change.

Signed-off-by: Liz Rea <lrea@nekls.org>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 14a0c39e8439eeaa32d24deaa3d7b6601eff5570)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>