Fix Error Propagation from run.js

[heri16]

Fix Error Propagation from run.js when return code !== 0

What did you implement:

When invoking a local lambda function, and return code === 1 due to an error thrown from inside the Lambda function, reject(result) will be called.

This means that output.errorMessage will not be converted into a proper Error Object.

See: https://github.com/serverless-community-labs/serverless-plugin-simulate/blob/9579e5dabb5b8b0fb2fcdcbe747325057ec43e5e/lib/invoke/run.js#L69-L72

See: https://github.com/serverless-community-labs/serverless-plugin-simulate/blob/9579e5dabb5b8b0fb2fcdcbe747325057ec43e5e/lib/invoke/local.js#L65-L79

How did you implement it:

Add Promise.catch()

How can we verify it:

throw an Error inside a Lambda function that is being invoked.

Todos:

• [ ] Write tests
• [ ] Write documentation
• [ ] Fix linting errors
• [ ] Provide verification config/commands/resources
• [ ] Change ready for review message below

Is this ready for review?: YES