TypeError: argument of type 'NoneType' is not iterable

[sentry-io]

Happens when saving Ruby YAML

Sentry Issue: WEBLATE-8FB

TypeError: argument of type 'NoneType' is not iterable
(10 additional frame(s) were not displayed)
...
  File "weblate/formats/ttkit.py", line 302, in save_content
    self.store.serialize(handle)
  File "translate/storage/yaml.py", line 118, in serialize
    self.serialize_units(units)
  File "translate/storage/base.py", line 1008, in serialize_units
    unit.storevalues(output)
  File "translate/storage/yaml.py", line 81, in storevalues
    self.storevalue(output, self.convert_target())
  File "translate/storage/base.py", line 957, in storevalue
    if key not in target or isinstance(target[key], str):

[github-actions]

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