Fix error in the cron task

ffdnispdb/cron_task.py

@@ -134,7 +134,7 @@ try:
                 print log.rstrip().encode('utf-8')+'\n'
                 if exc:
                     print u'Unexpected exception in the validator: %r' % exc
-                    print exc_log
+                    print exc_trace
 
                 continue