docs(contributing): add a guide for checking of undefined or null
#1963
| Job | Run time |
|---|---|
| 2m 25s | |
| 18s | |
| 3m 21s | |
| 9s | |
| 3m 23s | |
| 9m 36s |
undefined or null
#1963
| Job | Run time |
|---|---|
| 2m 25s | |
| 18s | |
| 3m 21s | |
| 9s | |
| 3m 23s | |
| 9m 36s |