Test on user.identities existence

Hi/Bonjour @MrBE4R,

Thank you/Merci beaucoup for the script.

I think we should add a test on the user.identities existence to avoid the following error (with the root account for example)

if user.identities and len(user.identities) > 0 and 'extern_uid' in user.identities[0]:
    gitlab_group['members'].append({
        'username': user.username,
        'name': user.name,
        'identities': user.identities[0]['extern_uid'],
       'email': user.email
   })
else:
   print(f"User {user.username} does not have a valid 'extern_uid' in identities.")

Here an execution with the additional test:

Thank you again!

Cheers,
Nicolas