ci: Fix traceback when user doesn't have a cerbero fork
authorNirbheek Chauhan <nirbheek@centricular.com>
Wed, 26 Oct 2022 09:17:52 +0000 (14:47 +0530)
committerNirbheek Chauhan <nirbheek@centricular.com>
Wed, 26 Oct 2022 09:19:14 +0000 (14:49 +0530)
commit9fc753a4eb10d120fb8460935205fd709fa871b4
treed9b47337b612003e561d6ba74d51df180aa5c25d
parentba24191f2ab5e5acf29992602ccde2eaac071efc
ci: Fix traceback when user doesn't have a cerbero fork

```
Traceback (most recent call last):
  File "ci/gitlab/trigger_cerbero_pipeline.py", line 59, in <module>
    if cerbero is None:
NameError: name 'cerbero' is not defined
```

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3063>
ci/gitlab/trigger_cerbero_pipeline.py