toaster: Test that exception isn't thrown by project page

toaster: Test that exception isn't thrown by project page

Add a test which checks that an exception is no longer thrown
for the /toastergui/project/X page for the default project.

Note that we still get a spinning dialogue box on this page
because the default project has no configuration to display,
but at least it doesn't fail altogether.

[YOCTO #8277]

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>