### Steps to reproduce

_Please write down the steps to reproduce. Try to write down all necessary preconditions (what permissions do you have, are other users involved?). Example:_

1. Have a project with work packages and backlogs module active Begin of the insertion

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End of the deletion 2. Have at least three work packages Begin of the insertion

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End of the deletion 3. Select and bulk edit two work packages Begin of the insertion

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End of the deletion 4. Enter a string into the parent, which is NOT the ID Begin of the insertion(reproducible with #ID as well).


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End of the deletion ### What is the buggy behavior?

_Please describe the bug in as much detail as possible. Example:_

* Internal error returned Begin of the insertion


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End of the deletion ### What is the expected behavior?

_Describe how the application should behave like. Example:_

1. Regular error is shown that parent cannot be found Begin of the insertion


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End of the deletion ### **Logs**

```text
ERROR -- : [1684409132_8331487_9b86138a_acb7_4de6_ab96_545d0c958cbe] user=2 tenant=1684409132_8331487_9b86138a_acb7_4de6_ab96_545d0c958cbe shard=multitenancy-trials1 undefined method `ancestors' for nil:NilClass: undefined method `ancestors' for nil:NilClass
[NoMethodError] undefined method `ancestors' for nil:NilClass: modules/backlogs/lib/open_project/backlogs/patches/set_attributes_service_patch.rb:73:in `ancestor_chain'; modules/backlogs/lib/open_project/backlogs/patches/set_attributes_service_patch.rb:52:in `closest_story_or_impediment'; modules/backlogs/lib/open_project/backlogs/patches/set_attributes_service_patch.rb:43:in `set_attributes'; app/services/base_services/set_attributes.rb:44:in `perform'; app/services/base_services/base_callable.rb:40:in `block in call'; app/services/concerns/with_reversible_state.rb:53:in `assign_state'; app/services/base_services/base_callable.rb:39:in `call'; app/services/base_services/write.rb:60:in `set_attributes'; app/serv
```

###