Allow a name to be removed from nro name_instance table

[perkinss]

Issue #, if available:
bcgov/entity#54

Description of changes:
Check whether new name is blank before adding a new row to the name_instance table in nro.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the namex license (Apache 2.0).

[katiemcgoff]

I believe there is an api change needed too - current code just blanks out name but doesn't remove the name record. The record needs to be removed from Namex db, otherwise it's considered a name to be actioned on - ie: if name 3 is "removed" (just blanked out), user can reject 1, reject 2, and now we're on name 3 trying to make a decision on a blank name. This is a bug.

[perkinss]

Oh! thanks for catching that
I'll look into it

[katiemcgoff]

Looks like this doesn't quite work - because the name record is deleted from the postgres db, it doesn't exist in the "nrd" object that is passed to the change_nr() function. So it doesn't get removed from NRO.

[katiemcgoff]

There is one remaining issue, in postgres now, due to the changed behaviour. Closing this PR.

KBM note - nevermind, it's all fine. Approving.