vdoc: fix out path if -o is not passed but input has a path, add test
#4981
| Job | Run time |
|---|---|
| 1m 23s | |
| 1m 23s |
-o is not passed but input has a path, add test
#4981
| Job | Run time |
|---|---|
| 1m 23s | |
| 1m 23s |