WIP: fix DVC functionality

[svlandeg]

Description

cf https://github.com/explosion/weasel/issues/82

Types of change

bug fix

Checklist

• [x] I confirm that I have the right to submit this contribution under the project's MIT license.
• [x] I ran the test suite, and all new and existing tests passed.
• [x] My changes don't require a change to the documentation, or if they do, I've added all required information.