AWSTemplateFormatVersion: 2010-09-09
Description: Sample Product

Parameters:
  BucketName:
    Type: String
    Default: ""

Conditions:
  BucketNameEmpty: !Equals [!Ref BucketName, ""]

Resources:
  S3Bucket:
    Type: 'AWS::S3::Bucket'
    DeletionPolicy: Retain
    Properties:
      BucketName: !If [BucketNameEmpty, !Ref AWS::NoValue, !Ref BucketName]

Outputs: 
  BucketName:
    Value: !Ref S3Bucket