## Description

This PR adds a check which ensures that empty selection sets (i.e.,
selecting a field of object type (or list of object type)) in queries
raise an error.

## Changelog

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### Product
_(Select all products this will be available in)_
- [x] community-edition
- [x] cloud
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### Type
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- [ ] highlight
- [ ] enhancement
- [x] bugfix
- [ ] behaviour-change
- [ ] performance-enhancement
- [ ] security-fix
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### Changelog entry
<!--
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Ensure to reject queries with empty selection sets

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V3_GIT_ORIGIN_REV_ID: 79049c39b58288f39ec29ecf713cc3622842d47e