seed-importer: set empty search path on init.
seed-importer: set empty search path on init.

If `imports` is available, there's no reason to error out with
a cryptic message (`searchPath` is not an array), it's better to
just let the import attempt happen, with the user obtaining
an undefined object instead of an exception.

https://bugzilla.gnome.org/show_bug.cgi?id=771520

danilocesar/seed,danilocesar/seed,danilocesar/seed,danilocesar/seed,danilocesar/seed