Crashes when labels (which were used by existing issues) are deleted (wiped from existence)

```
Run dessant/support-requests@v4
with:
github-token: ***
support-label: Support request
issue-comment: Hi, we only accept **bug reports** on this issue tracker, but this issue looks like a support request.

Instead of creating an issue, try the following:
- Check our [Documentation](https://doc.pmmp.io/) to see if you can find answers there
- Ask the community on our [Discord server](https://discord.gg/bmSAZBG) or our [Forums](https://forums.pmmp.io/)

[Docs](https://pmmp.rtfd.io/) | [Discord](https://discord.gg/bmSAZBG) | [Forums](https://forums.pmmp.io/)

close-issue: true
lock-issue: false
issue-close-reason: not planned
issue-lock-reason: off-topic
Error: TypeError: Cannot read properties of undefined (reading 'name')
```

This error occurred when deleting labels which were attached to closed issues.