fix invalid physicalResourceId if any handler got exception

[wenxu1024]

When using this package, if the handler raise exception. The CFN stack just output "Invalid PhysicalResourceID" instead of output the real error message.

In the source code provided by AWS the physical resource ID is set to lambda logStreamName if not defined.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-lambda-function-code-cfnresponsemodule.html#cfn-lambda-function-code-cfnresponsemodule-source