Do not send notifications for transfers that are still being uploaded

[helrond]

Transfers should not be checked until they have been completely uploaded. For large transfers, a check is necessary to ensure the bag is not in the process of being transferred.

Checking while bags are still being transferred results in incorrect error messages and failure reports.

[helrond]

use lsof to determine if file(s) are open?

We do not need to account for large transfers either with special notification messages or in the UI.

[helrond]

Fix in 667bf5b appears to hold processing if any file in uploads/ directory is open, which will likely create huge processing backlogs. This also has implications for email notification (delivery is delayed because processing is stopped).

Desired behavior is to process all bags not containing open files.

[helrond]

Additionally, if the upload of a large bag fails, this blocks all processing indefinitely.

[helrond]

Disregard two comments above - they represent a misunderstanding of the issue, which was actually cased by an unserialized bag with an illegal filename.

[helrond]

This is currently working!