AST in out/*.sol/*.json has fields missing

[antonper]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (b554ab1 2022-10-17T00:08:53.911501071Z)

What command(s) is the bug in?

forge build

Operating System

Linux

Describe the bug

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

contract Bar1{
}

Such contract built by forge would have ContractDefinition.nodes field empty inside the ast of the out json.
Solidity keeps "nodes": [] in that case.
I am not sure this difference is desired.

[antonper]

This change introduced another bug. Now all nodes have "nodes":[] fields even if they should not have them. E.g. PragmaDirective