Tests are aborted when update from 1.0.5 to latest

Description

Steps to reproduce

1. Create a test using version 1.0.5.
2. Run the test with some views and conversions.
3. Update the site to the latest AB test build (testing version is build 2.4.1)
4. Open the site again and check the active tests in step 2

Expected
Active tests remain after the update.

Actual
No active tests. All tests are aborted.