fix bug in entity locking.

[lovettchris]

Pull Request Template

Description

Entity locking was confused when the node column was equal to empty string. This should mean the node is not locked.

Fixes: # (issue)

Changes

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (causes existing functionality to not work as expected)
• [ ] Documentation update

Configuration:

• Archai version:
• Environment:
• OS:

Final checks:

• [x] Follows guidelines of project
• [x] Self-review of code
• [x] Commented code in hard-to-understand areas
• [x] Corresponding changes to the documentation
• [x] Changes generate no new warnings
• [x] Dependent changes have already been merged
• [x] Checked code correction any misspellings