Some fields are optional during "stopAfter":"parsing"

[wtdcode]

Trivial patch.

Reproduce:

echo '{"language":"Solidity","sources":{"test.sol":{"content":"contract TT {\\n    function main() public {}\\n}"}},"settings":{"stopAfter":"parsing","optimizer":{"enabled":false,"runs":200},"outputSelection":{"*":{"":["ast"],"*":[]}},"viaIR":true,"libraries":{}}}' | solc --standard-json

Since there is no semantics analysis when stopping after parsing, scope along with a few other fields are not available and this PR marks all scope to be optional.

[mattsse]

makes sense,

do you need another patch for this right away?

[wtdcode]

makes sense,

do you need another patch for this right away?

Thanks for the instant response. I'm looking into solidity code to check all fields not emitted in this case.

Will raise another PR when I find more fields.

[wtdcode]

Pretty hard to determine the exact full set of fields that need to be optional from the source code since they do not have schema like serde. Will get another PR when I finish parsing more solidity code =).