[autotest] Remove pointless if statement.

`for x in []: pass` is a no-op anyway, so there's no point in checking
to see if there's elements in the list.

No scheduler deploy, as this is just a code beauty change.

TEST=scheduler runs
BUG=None

Change-Id: Ia895da329b8529c7c6b64ccd10964be25a000ccd
Reviewed-on: https://gerrit.chromium.org/gerrit/64445
Tested-by: Alex Miller <milleral@chromium.org>
Reviewed-by: Prashanth Balasubramanian <beeps@chromium.org>
Commit-Queue: Alex Miller <milleral@chromium.org>
diff --git a/scheduler/monitor_db.py b/scheduler/monitor_db.py
index 39276d8..327553d 100755
--- a/scheduler/monitor_db.py
+++ b/scheduler/monitor_db.py
@@ -1581,9 +1581,8 @@
         pending_tasks = models.SpecialTask.objects.filter(
                 queue_entry__id=self.queue_entry.id,
                 is_complete=0)
-        if pending_tasks:
-            for task in pending_tasks:
-                task.finish(False)
+        for task in pending_tasks:
+            task.finish(False)
 
 
     def cleanup(self):