S3 scan on demand failing when scanning bucket containing folders

[malexios]

When running quickscan_target.py against an S3 bucket containing folders, it fails when it tries to scan the folder object.

Steps to Reproduce:
Create an S3 bucket and add test objects
Run quickscan

Add an object in a folder
run quickscan

Expected Behavior:
The files will be uploaded and scanned

Actual Behavior:
When the script attempts to scan the folder, it will error out when attempting to upload the folder

File "/home/me/quickscan_target.py", line 307, in
upload_bucket_samples()
File "/home/me/quickscan_target.py", line 150, in upload_bucket_samples
sha = response["body"]["resources"][0]["sha256"]

Possible Cause:
When you create a folder in Amazon S3, S3 creates a 0-byte object with a key that's set to the folder name.
When scanning a bucket containing folders, quickscan_target.py attempts to get the object filename via os.path.basename. When the object is a folder, it results in filename, response and sha being empty and the script crashes when calling the analyzer.

Resolution:
Change line 137 to:
for item in [files for files in summaries if files.size != 0]: