[Bug]: Build failing on null telephone when there is an email address

[katjam]

Description

Build with a partner having contact email without phone.

Json.Decode.oneOf failed in the following 2 ways:
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09:10:26.610 |  
09:10:26.610 |  
09:10:26.610 |  
09:10:26.611 | (1) Problem with the value at json.telephone:
09:10:26.611 |  
09:10:26.611 | null
09:10:26.611 |  
09:10:26.611 | Expecting a STRING
09:10:26.611 |  
09:10:26.611 |  
09:10:26.611 |  
09:10:26.611 | (2) Problem with the given value:
09:10:26.612 |  
09:10:26.612 | {
09:10:26.612 | "email": "hello@materialgrrrlz.com",
09:10:26.612 | "telephone": null
09:10:26.612 | }
09:10:26.612 |  
09:10:26.612 | Expecting null