Make fields of provenance not null, and fix other validation issues

[bennybp]

Description

This PR migrates some old data in the database. This old data was causing validation errors.

Errors fixed:

• Molecule where connectivity is an empty list (should either be None or a list with length > 1) (See https://github.com/MolSSI/QCArchiveExamples/issues/16)
• Provenance fields that were None/null (should be empty string)
• Result properties with mp2_total_correlation_energy (should be mp2_correlation_energy)

This has been thoroughly tested against a copy of the production database to ensure integrity (ie, it doesn't change data unless it needs to be changed)

Changelog description

Provide data migration for old data that no longer passes validation

Status

• [X] Code base linted
• [X] Ready to go

[codecov[bot]]

Codecov Report

Merging #676 (8006a9a) into master (be18140) will decrease coverage by 0.39%. The diff coverage is n/a.

[bennybp]

Failed tests are unrelated to this PR