AMAZON_EC2_AUDITOR is failing with exception: list index out of range

[vishal-yadav-safe]

Describe the bug
In AMAZON_EC2_AUDITOR, is failing with with exception: list index out of range.

This is happening in this code snippet :

  try:
              instanceLaunchedAt = i["BlockDeviceMappings"][0]["Ebs"]["AttachTime"]
        except KeyError:
            instanceLaunchedAt = i["LaunchTime"]

1. i["BlockDeviceMappings"] Might Be an Empty List
   If an EC2 instance has no block device mappings, BlockDeviceMappings will be an empty list ([]).
   Trying to access index 0 (BlockDeviceMappings[0]) when the list is empty will result in a list index out of range
   error.

2. Ebs Key Might Not Exist
   Even if BlockDeviceMappings contains elements, there is no guarantee that the first entry
   (BlockDeviceMappings[0]) has an "Ebs" key.
   If it does not, trying to access ["Ebs"]["AttachTime"] will raise a KeyError

To Reproduce
Steps to reproduce the behavior:
Run EC2 auditor specifically , this error can be seen

Expected behavior
There should be proper handling of this to prevent such errors.

Screenshots
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Logs
Any stack traces, error reports, CloudTrail logs, etc.

Additional context
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[vishal-yadav-safe]

Raised a PR to fix this issue - #316