Fix NaN error message when FTL is offline (#2548)

scripts/pi-hole/js/index.js

@@ -678,7 +678,6 @@ function updateSummaryData(runOnce) {
       updateTopLists();
     }
 
-    var formatter = new Intl.NumberFormat();
     //Element name might have a different name to the property of the API so we split it at |
     [
       "ads_blocked_today|queries_blocked_today",
@@ -691,9 +690,17 @@ function updateSummaryData(runOnce) {
       var apiName = apiElName[0];
       var elName = apiElName[1];
       var $todayElement = elName ? $("span#" + elName) : $("span#" + apiName);
-      // Round to one decimal place and format locale-aware
-      var text = formatter.format(Math.round(data[apiName] * 10) / 10);
-      var textData = idx === 2 && data[apiName] !== "to" ? text + "%" : text;
+
+      var textData = data[apiName];
+      if (!FTLoffline) {
+        // Only format as number if FTL is online
+        var formatter = new Intl.NumberFormat();
+
+        // Round to one decimal place and format locale-aware
+        var text = formatter.format(Math.round(data[apiName] * 10) / 10);
+        textData = idx === 2 && data[apiName] !== "to" ? text + "%" : text;
+      }
+
       if ($todayElement.text() !== textData && $todayElement.text() !== textData + "%") {
         $todayElement.addClass("glow");
         $todayElement.text(textData);