Fix doughnutTooltip if total percentage of shown slices is less than 0.1% (#2434)

scripts/pi-hole/js/index.js

@@ -732,7 +732,7 @@ function doughnutTooltip(tooltipLabel) {
   // in case the item share is really small it could be rounded to 0.0
   // we compensate for this
   var itemPercentage =
-    tooltipLabel.parsed.toFixed(1) === 0 ? "< 0.1" : tooltipLabel.parsed.toFixed(1);
+    tooltipLabel.parsed.toFixed(1) === "0.0" ? "< 0.1" : tooltipLabel.parsed.toFixed(1);
 
   // even if no doughnut slice is hidden, sometimes percentageTotalShown is slightly less then 100
   // we therefore use 99.9 to decide if slices are hidden (we only show with 0.1 precision)
@@ -740,6 +740,9 @@ function doughnutTooltip(tooltipLabel) {
     // All items shown
     return label + ": " + itemPercentage + "%";
   } else {
+    // set percentageTotalShown again without rounding to account
+    // for cases where the total shown percentage would be <0.1% of all
+    percentageTotalShown = tooltipLabel.chart._metasets[0].total;
     return (
       label +
       ":<br>&bull; " +