Cover empty field-selections #4228
Merged
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Closes #3790
This follows the spec closer to the letter as we consider empty selection-sets invalid as well. This however does not cover empty operation-definitions, which should also be considered invalid.
The parser itself considers empty-selections invalid as it requires you to specify a name before a closing curly, hence why testing happens a bit more manual here. Despite our parser not considering this valid, I think this is good to validate when folks use a separate parser or construct documents manually as this is valid in our type-system.