Handle errors from JSON serialization. (#666)

SHA: 026dbaa
Reason: push, by cbiesinger

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

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+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2024-10-28">28 October 2024</time></p>
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@@ -2049,6 +2049,8 @@ <h4 class="heading settled" data-level="2.2.7" id="fetch-identity-assertion"><sp
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        <li data-md>
         <p>Let <var>json</var> be the result of <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#serialize-a-javascript-value-to-a-json-string" id="ref-for-serialize-a-javascript-value-to-a-json-string">serializing a JavaScript value to a JSON string</a> with <var>provider</var>’s <code class="idl"><a data-link-type="idl" href="#dom-identityproviderrequestoptions-params" id="ref-for-dom-identityproviderrequestoptions-params①">params</a></code>.</p>
+       <li data-md>
+        <p>If serializing threw an exception, return failure.</p>
        <li data-md>
         <p>Append ("params", <var>json</var>) to <var>list</var>.</p>
       </ol>