Minor fix in values to histogram conversion

Filter out values outside the min and max boundaries
because they are assigned to uninitialized buckets
(outside min and max bounds).

public/app/plugins/panel/graph/histogram.ts

@@ -43,6 +43,10 @@ export function convertValuesToHistogram(values: number[], bucketSize: number, m
   }
 
   for (let i = 0; i < values.length; i++) {
+    // filter out values outside the min and max boundaries
+    if (values[i] < min || values[i] > max) {
+      continue;
+    }
     const bound = getBucketBound(values[i], bucketSize);
     histogram[bound] = histogram[bound] + 1;
   }