def find_first(name)
      bucket = build(name)
      bucket.retrieve
    rescue Error::ForbiddenBucket, Error::NoSuchBucket
      nil
    end
def find_first(name)
      bucket = build(name)
      bucket.retrieve
    rescue Error::ForbiddenBucket, Error::NoSuchBucket
      nil
    end
Finds the bucket with given name (only those which exist and You have access to it)
 return nil in case Error::NoSuchBucket or Error::ForbiddenBucket