Errors are not returned in Lambda Resolvers

[half2me]

Describe the bug
Following the example here: https://docs.amplify.aws/cli/graphql-transformer/function I created a lambda resolver for one of my GraphQL queries. If I make an GraphQL query and my lambda function throws an error, it does not propagate to GraphQL. Instead, it just returns an empty response.

Amplify CLI Version
4.37.1

To Reproduce

1. Generate a lambda resolver: amplify add function
2. Add the @function directive to a GraphQL field
3. In the lambda resolver, use this code for an example:

exports.handler = async (event) => {
  throw new Error("Foo");
}

4. Run amplify mock
   If I just return some normal data, everything works fine, but as soon as I throw an error, my response is empty (GraphQL usually complains about missing fields at this point, because some of my fields are mandatory, and I'm not filling them out)

Expected behavior
Looking at the generated InvokeFooDataSource.res.vtl resolver mapping template, I see the following code:

## [Start] Handle error or return result. **
#if( $ctx.error )
  $util.error($ctx.error.message, $ctx.error.type)
#end
$util.toJson($ctx.result)
## [End] Handle error or return result. **

I would expect $ctx.error to contain my error object, but it is always empty.

Desktop (please complete the following information):

• OS: Mac
• Node Version: v12.20.0

[half2me]

@dabit3 this is the issue I mentioned on Discord

[attilah]

@half2me I was able to reproduce it, #6096 fixes it.

[half2me]

thanks @attilah, much appreciated! 😃

[github-actions]

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