Fix issue with example product creation.
Fix issue with example product creation.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=136157755

googleads/googleads-shopping-samples,googleads/googleads-shopping-samples,googleads/googleads-shopping-samples,googleads/googleads-shopping-samples,googleads/googleads-shopping-samples,googleads/googleads-shopping-samples