fix(semantic): allow root_node to be empty for empty trees.
#1533
| Job | Run time |
|---|---|
| 2m 4s | |
| 1s | |
| 2m 5s |
root_node to be empty for empty trees.
#1533
| Job | Run time |
|---|---|
| 2m 4s | |
| 1s | |
| 2m 5s |