ValueError: Failed to parse external definition ' '

Sentry Issue: SWH-LOADER-SVN-EV

ValueError: Failed to parse external definition '     '
(1 additional frame(s) were not displayed)
...
  File "swh/loader/svn/loader.py", line 875, in prepare
    last_loaded_svn_rev, last_loaded_rev
  File "swh/loader/svn/loader.py", line 233, in check_history_not_altered
    commit, root_dir = self.svnrepo.swh_hash_data_at_revision(revision_start)
  File "swh/loader/svn/svn_repo.py", line 609, in swh_hash_data_at_revision
    local_dirname, local_url = self.export_temporary(revision)
  File "swh/loader/svn/svn_repo.py", line 483, in export_temporary
    external_def.rstrip("\r"), path, self.origin_url
  File "swh/loader/svn/utils.py", line 340, in parse_external_definition
    raise ValueError(f"Failed to parse external definition '{external}'")

Loading failure, updating to `failed` status

while loading https://svn.code.sf.net/p/dcm4che/svn