Handle non-OK port status responses in enable flow

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Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

app/sovran_systemsos_web/static/js/features.js

@@ -384,7 +384,10 @@ function handleFeatureToggle(feat, newEnabled) {
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify({ ports: ports }),
     })
-      .then(function(r) { return r.json(); })
+      .then(function(r) {
+        if (!r.ok) throw new Error("Port status request failed: " + r.status);
+        return r.json();
+      })
       .then(function(data) {
         var portStatuses = {};
         (data.ports || []).forEach(function(p) {