fix repeating of last log line

Author: icewind1991

controller/logcontroller.php

@@ -60,7 +60,7 @@ protected function responseFromIterator(\Iterator $iterator, $count, $offset) {
 			$iterator->next();
 		}
 		$data = [];
-		for ($i = 0; $i < $count; $i++) {
+		for ($i = 0; $i < $count && $iterator->valid(); $i++) {
 			$line = $iterator->current();
 			if (!is_null($line)) {
 				$data[] = $line;