The copyright and license notice is already in the LICENSE file. There
is no justifiable reason to also require that it be included in every
file, since the individual files are not individually distributed except
as part of the entire package.
The REPL global object lazy loads modules by placing getters for each.
This causes MakeDomainCallback() to be run if a native module is loaded
from the REPL, but if the domain module hasn't been loaded then there
are no enter/exit callbacks to be called. Causing an assert() to fail.
Fix the issue by conditionally running the callback instead of asserting
it is available. Also add "addon" test to verify the fix.
Fixes: #8231
Signed-off-by: Trevor Norris <trev.norris@gmail.com>
