fix(snaptshot): Ensure attr.name is defined when collecting element…

… attributes (#160)

Probably fixes
getsentry/sentry-javascript#10292

Not sure how `attr.name` could be undefined here but according to the
issue, it happens and we should probably guard adding the attribute.

packages/rrweb-snapshot/src/snapshot.ts

@@ -814,7 +814,9 @@ function serializeElementNode(
   const len = n.attributes.length;
   for (let i = 0; i < len; i++) {
     const attr = n.attributes[i];
-    if (!ignoreAttribute(tagName, attr.name, attr.value)) {
+    // Looks like `attr.name` can be undefined although the types say differently
+    // see: https://github.com/getsentry/sentry-javascript/issues/10292
+    if (attr.name && !ignoreAttribute(tagName, attr.name, attr.value)) {
       attributes[attr.name] = transformAttribute(
         doc,
         tagName,