The cli parameter --dump-ast Json panics

[raskad]

Describe the bug
Whey trying to output the AST with the cli parameter --dump-ast Json or --dump-ast JsonPretty boa panics.

To Reproduce

This JavaScript code reproduces the issue:
run the following code with cargo run -- --dump-ast Json

let a = 1

thread 'main' panicked at 'could not convert AST to a pretty JSON string: Error("can only flatten structs and maps (got a sequence)", line: 0, column: 0)', boa_cli/src/main.rs:181:30

Expected behavior
Print the AST in JSON format.

[hemantku]

Hi, My name is Vineet. I would work on this issue if this is still available

[raskad]

Hi @hemantku, thank you for your interest in contributing to boa!
(Un)fortunately this will already be fixed in #1959

I noticed, that we don't have many good first issues currently. If you do not find one that looks interesting to you, I recommend heading to our conformance page and checking out some currently failing tests, for which we do not have an issue open. That may be a good starting point if you want to help us improve our test coverage :)