rebase-helper propose-update failed with traceback on git push --force

I have tried to update rebase-helper by packit but it failed with traceback. .packit.yml configuration file is here: https://github.com/rebase-helper/rebase-helper/blob/master/.packit.yaml

$ packit propose-update
Checking out upstream version 0.16.2
using "master" dist-git branch
syncing ./.packit.yaml
syncing ./rebase-helper.spec
INFO: Running 'anitya' versioneer
INFO: Downloading file from URL https://github.com/rebase-helper/rebase-helper/archive/0.16.2/rebase-helper-0.16.2.tar.gz
    [       <=>                    ]     1.80M   in 00:00:01
downloaded archive: /tmp/tmpeqbb9vh6/rebase-helper-0.16.2.tar.gz
uploading to the lookaside cache
ERROR    Cmd('git') failed due to: exit code(128)
  cmdline: git push --force --porcelain fork 0.16.2-master-update
  stderr: 'fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.'
Unexpected exception occurred,
please fill an issue here:
https://github.com/packit-service/packit/issues

[TomasTomecek]

Cool, so we should just catch the giterror exc and reraise as packit exc.

[lachmanfrantisek]

One TODO I have in mind: how about changing the top-most try/catch to: if packitexc is raised, just tell that there was an error during execution and if generic exc is being caught, we should inform user about reporting the issue.

If I got your idea, this is the current state: https://github.com/packit-service/packit/blob/master/packit/cli/utils.py#L30