[engine] Fix NPE while collecting variables data containing variable with null value
#14075
Run time
Learn about OS # on GitHub Actions| Job | Run time |
|---|---|
| 47m 3s | |
| 1h 8m 30s | |
| 5m 7s | |
| 25m 29s | |
| 14m 24s | |
| 27m 8s | |
| 3h 7m 41s |