fixed issue with average setups producing invalid results

app/src/content/embeds/d3-benchmark-comparison.html

@@ -825,9 +825,16 @@
           if (SETUPS && setupNames.length >= 2) {
             const avg = computeAverageData(parsed);
             avgDatasets = avg.datasets;
-            parsedData = parsed.concat(avg.data);
-            parsedData.columns = parsed.columns;
-            if (currentSetup === AVG_SETUP_KEY) DATASETS = { ...avgDatasets };
+            const hasAvgData = Object.values(avgDatasets).some(o => !o.baseline);
+            if (hasAvgData) {
+              parsedData = parsed.concat(avg.data);
+              parsedData.columns = parsed.columns;
+              if (currentSetup === AVG_SETUP_KEY) DATASETS = { ...avgDatasets };
+            } else {
+              const sel = container.querySelector('#setup-' + uid);
+              if (sel) { const o = sel.querySelector(`option[value="${AVG_SETUP_KEY}"]`); if (o) o.remove(); }
+              if (currentSetup === AVG_SETUP_KEY) { currentSetup = setupNames[0]; DATASETS = normalizeDatasets(SETUPS[currentSetup].datasets); if (sel) sel.value = currentSetup; }
+            }
           }
           filterData();
           metricKeys = detectMetrics(allData.columns);