[migration-tools] Handle repositories with no release entry. (ros#25476)

Earlier versions of foxy did not have any repositories without release
entries. This covers that case by:
* Copying all repositories entries, even those that lack release entries.
* Only attempting to bloom repositories which have release entries.

migration-tools/migrate-rosdistro.py

@@ -80,13 +80,15 @@ def write_tracks_file(tracks, commit_msg=None):
 repositories_to_retry = []
 for repo_name, repo_data in sorted(source_distribution.repositories.items()):
  if repo_name not in dest_distribution.repositories:
- new_repositories.append(repo_name)
  dest_repo_data = copy.deepcopy(repo_data)
- release_tag = dest_repo_data.release_repository.tags['release']
- release_tag = release_tag.replace(args.source,args.dest)
- dest_repo_data.release_repository.tags['release'] = release_tag
+ if dest_repo_data.release_repository:
+ new_repositories.append(repo_name)
+ release_tag = dest_repo_data.release_repository.tags['release']
+ release_tag = release_tag.replace(args.source,args.dest)
+ dest_repo_data.release_repository.tags['release'] = release_tag
  dest_distribution.repositories[repo_name] = dest_repo_data
- elif dest_distribution.repositories[repo_name].release_repository.version is None:
+ elif dest_distribution.repositories[repo_name].release_repository is not None and \
+ dest_distribution.repositories[repo_name].release_repository.version is None:
  dest_distribution.repositories[repo_name].release_repository.version = repo_data.release_repository.version
  repositories_to_retry.append(repo_name)
  else: