Problem: AMClient get_unit_status returns error when unit is in between transfer and ingest

[liptakpanna]

Expected behaviour

Using the AMClient I start a transfer with the create_package method. I get the UUID, and I want to query the status using the get_unit_status to see when it finishes or fails. If the package is still being processed or is waiting in a queue then it should not return an error ideally.

Current behaviour

If the transfer stage finished, but the ingest phase has not been started yet because the workers are too busy then it returns a 400 status code error (Unable to determine the status of the unit ...). But the ingest will start later and the package will be completed, so it is a misleading response.

The problem might be here. If it just returns the ingest status which doesn't exist yet then we lose the valuable information that the transfer was completed without an error and the unit is waiting in a queue.

Steps to reproduce

Send more transfers to an AM instance than it can handle and keep querying every unit UUID quite often to make this error occur.

Your environment (version of Archivematica, operating system, other relevant details)

AM version 1.16, AMClient version 1.2.0

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