fix(event_handler): Updating body to empty-json instead of empty-string

[tushar-sahay-np]

Issue number: #2254

Summary

Changes

Updated response of body in case when the powertool router does not find any API's mapped to the request. The body is updated from empty-string "" to empty-json {}

User experience

Earlier, the API Gateway responded with 500 internal server error for a pre-flight CORS request. After the change, the API is succesfully called.

Checklist

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• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

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[tushar-sahay-np]

Fix for Issue : #2254

[leandrodamascena]

I added a "do-not-merge" label because I couldn't reproduce the error.

#2254 (comment)

[heitorlessa]

Closing; we can re-open once the related issue can be reproduced.