Add S3 head_bucket helper #21
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This PR adds a new helper,
boto3_helpers.s3.head_bucket.The boto3 docs, as of this writing, list
S3.Client.exceptions.NoSuchBucketas the only exception that the S3 client'shead_bucketwill raise.Alas, this issue and others correctly note that this does exception does not get raised if you ask for a bucket that does not exist. A generic
ClientErroris raised instead.This new function actually raises the correct exception.
CC: @bphamwurl