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Editing a serial and removing the dates in the "Published on" and "Expected on" fields generated a 500 error (Serials > [selected serial] > Serial collection).
This fixes the error and:
- Sets the data in the database to NULL
- Shows the dates as "Unknown" in the serial collection table for the "Date published" and "Date received" columns
- Changes any existing 0000-00-00 dates in the database to NULL (for existing installations)
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