fix: Handle undefined or null errors

[seb-cr]

Thrown errors or promise rejections should always be an instance of Error in best practice, however we found a couple of places recently where a promise was being rejected with undefined. Lambda Wrapper's error handling failed with a TypeError:

TypeError: Cannot destructure property 'code' of 'error' as it is undefined.
    at Function.handleError (/var/task/node_modules/@comicrelief/lambda-wrapper/src/core/LambdaWrapper.ts:185:7)
    at wrapper (/var/task/node_modules/@comicrelief/lambda-wrapper/src/core/LambdaWrapper.ts:98:39)

Lambda Wrapper should gracefully handle any kind of error thrown at it.

Jira: ENG-4917

[github-actions]

🎉 This PR is included in version 2.1.3 🎉

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• npm package (@latest dist-tag)
• GitHub release

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