Cannot access a MARC bib because creator has been deleted. Handling a 404 error.

Verified at MG Bugfest environment for MARC Bibliographic, MARC Authority, MARC Holdings records - works as expected.

If the user which imported \ created \ edited MARC record was deleted, then an error message displays when another user tries to open that MARC record.
See attached screencast:

The following scenarios are tested:

1) Imported via Data import MARC Bibliographic record.
2) Imported via Import single bibliographic record.
3) Edited MARC Bibliographic record.
4) Imported via Data import MARC Holdings record.
5) Created via quickMARC MARC Holdings record.
6) Imported via Data import MARC Authority record.
7) Edited MARC Authority record.

Deployed to MG bf. Please proceed with verification.

Cannot test on snapshot/snapshot-2 at this time due to DI instability.

Verified at Snapshot environment - now in the case if we don't receive some data from BE side, an error appears, and user redirected to the previous page. Works as expected. See attached screencast for some examples:

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The following scenarios were verified: 
1) Edit/Derive MARC Bibliographic record imported/edited by deleted user.
2) Edit MARC Holdings record imported/edited/created by deleted user.
3) Edit MARC Authority record imported/edited by deleted user.

hi
If we don't receive some of the data from BE, an error will appear and we will be redirected to the previous page.
It will apply to all records.