L2SS-340: Ignore packets without timestamp, log reason why we stopped processing.

devices/statistics_writer/statistics_writer.py

@@ -56,10 +56,10 @@ if __name__ == "__main__":
             writer.next_packet(packet)
     except KeyboardInterrupt:
         # user abort, don't complain
-        pass
+        logger.warning("Received keyboard interrupt. Stopping.")
     except EOFError:
         # done processing all input, don't complain
-        pass
+        logger.info("End of input.")
     finally:
         writer.close_writer()