docs(contributing): add a guide for checking of undefined or null
#1951
| Job | Run time |
|---|---|
| 1m 42s | |
| 9s | |
| 3m 28s | |
| 13s | |
| 2m 50s | |
| 8m 22s |
undefined or null
#1951
| Job | Run time |
|---|---|
| 1m 42s | |
| 9s | |
| 3m 28s | |
| 13s | |
| 2m 50s | |
| 8m 22s |