[astro] Fix graph view states (apache#17821)

When apache#17821 was cherry-picked into
OSS 2.1.4, the `for` (v2-1-stable) vs `forEach` (main) wasn't accounted
for, and this changed the behavior of the method.

apache#18607 attempted to fix it, but
ultimately didn't change anything because main wasn't actually broken.

The solution is to `continue` so we finish the loop, not short-circuit
out with `return`.

airflow/www/static/js/graph.js

@@ -454,7 +454,7 @@ function updateNodesStates(tis) {
   for (const nodeId of g.nodes()) {
     const { elem } = g.node(nodeId);
     if (!elem) {
-      return;
+      continue;
     }
     elem.setAttribute('class', `node enter ${getNodeState(nodeId, tis)}`);
     elem.setAttribute('data-toggle', 'tooltip');