Fix error when loading a checkpoint.

[Alexey-Kamenev]

Modulus Pull Request

Description

Fixes issue in checkpointing utility that causes an error when loading a checkpoint.

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [ ] The documentation is up to date with these changes.
• [ ] The CHANGELOG.md is up to date with these changes.
• [ ] An issue is linked to this pull request.

Dependencies

[Alexey-Kamenev]

/blossom-ci