CheckStatistics: Don't attempt to visualize next checks..

..if both active and passive checks are disabled.

fixes #930

Author: nilmerg

library/Icingadb/Widget/Detail/CheckStatistics.php

@@ -68,7 +68,7 @@ protected function assembleBody(BaseHtmlElement $body)
         $now = time();
         $executionTime = ($this->object->state->execution_time / 1000) + ($this->object->state->latency / 1000);
 
-        $nextCheckTime = $this->object->state->next_check !== null
+        $nextCheckTime = $this->object->state->next_check !== null && ! $this->isChecksDisabled()
             ? $this->object->state->next_check->getTimestamp()
             : null;
         if ($this->object->state->is_overdue) {