Try to improve calculation of visited urls/hour, a=chrisg

diff --git a/src/executables/QueueServer.php b/src/executables/QueueServer.php
index 36b62c05c..d15e91a47 100644
--- a/src/executables/QueueServer.php
+++ b/src/executables/QueueServer.php
@@ -2181,13 +2181,16 @@ class QueueServer implements CrawlConstants
         $crawl_status['COUNT'] = $info_bundle['COUNT'] ?? 0;
         $now = time();
         $change_in_time = C\ONE_HOUR + 1;
+        $least_recent_hourly_pair = [0, 0]; /* initial to something in case
+            while doesn't run */
         while (count($this->hourly_crawl_data) > 0 &&
             $change_in_time > C\ONE_HOUR) {
             $least_recent_hourly_pair = array_pop($this->hourly_crawl_data);
             $change_in_time =
                 ($now - $least_recent_hourly_pair[0]);
         }
-        if ($change_in_time <= C\ONE_HOUR) {
+        if ($change_in_time <= C\ONE_HOUR &&
+            $now - $least_recent_hourly_pair[0] < 2 * C\ONE_HOUR) {
             $this->hourly_crawl_data[] = $least_recent_hourly_pair;
         }
         array_unshift($this->hourly_crawl_data,
diff --git a/src/models/CrawlModel.php b/src/models/CrawlModel.php
index fdb035095..8841c3241 100755
--- a/src/models/CrawlModel.php
+++ b/src/models/CrawlModel.php
@@ -1450,8 +1450,8 @@ EOT;
                     floatval(C\ONE_HOUR);
                 $change_in_urls = $recent[1] - $oldest[1];
                 $data[$channel]['VISITED_URLS_COUNT_PER_HOUR'] =
-                    ($change_in_time_hours > 0) ?
-                    $change_in_urls/$change_in_time_hours : 0;
+                    min((($change_in_time_hours > 0) ?
+                    $change_in_urls/$change_in_time_hours : 0), 0);
             } else {
                 $data[$channel]['VISITED_URLS_COUNT_PER_HOUR'] = 0;
             }