Alert triggered errors fail to create GitHub issues without Issue Link Settings label

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

1. Enable GitHub integration
2. Create an issue alert
3. Configure 'Set conditions' (screenshot)
4. Configure 'Issue Link Settings' (select a 'GitHub Repository' and leave 'Labels' as '--')
5. Click 'Apply Changes'
7. Fill in 'Add a name and owner'
8. Click 'Save'
9. Trigger the Alert with an Error

### Expected Result

An issue should appear in that selected GitHub repositories issue section but does not.

### Actual Result

Now repeat steps 4,5,7,8 adding any label for 'Labels'. Now that issue appears in that selected GitHub repositories issue section with that label.

### Product Area

Alerts

### Link

_No response_

### DSN

_No response_

### Version

_No response_