[Openid-specs-ab] Issue #2064: Clarify that a null value is distinct from being omitted (openid/connect)

[mbj]

New issue 2064: Clarify that a null value is distinct from being omitted
https://bitbucket.org/openid/connect/issues/2064/clarify-that-a-null-value-is-distinct-from

Michael Jones:

We should use language parallel to this from Core 5.3.2:

> "If a Claim is not returned, that Claim Name SHOULD be omitted from the JSON object representing the Claims; it SHOULD NOT be present with a null or empty string value."

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Responsible: Michael Jones