Add null checks before attempting debug response writing #1840
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Issue #, if available:
#1328
Description of changes:
If the Lambda debug serialization environment variable is set a null pointer exception could be triggered if the Lambda function returned a null. This PR adds the null check to avoid going in the debug logic if the response is null.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.