allow file add to datasets with exisiting files #3454

[pdurbin]

RFI Checklist

1. Related Issues

• connects DUPLICATE: If a dataset had files in 4.5.1 and earlier, you can't add files after upgrading to develop #3454 If a dataset had files in 4.5.1 and earlier, you can't add files after upgrading to develop

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2. Pull Request Checklist

• Functionality completed as described in FRD
• Dependencies, risks, assumptions in FRD addressed
• Unit tests completed
• API tests completed (had to fix a bug in FileMetadataIT)
• Deployment requirements identified (e.g., SQL scripts, indexing) (3354-alt-checksum.sql and 3405-filemetadata-directory-label.sql have been consolidated into upgrade_v4.5.1_to_v4.6.sql)
• Documentation completed
• All code checkins completed

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3. Review Checklist

After the pull request has been submitted, fill out this section.

• Code review completed or waived
• Testing requirements completed
• Usability testing completed or waived
• Support testing completed or waived
• Merged with develop branch and resolved conflicts

Also, consolidate SQL upgrade scripts and persist nulls rather than
empty strings for directoryLabel.

[landreev]

Looks great... Pushing into QA.

[kcondon]

Added to 3459, closing this.