Check for valid websocket message before processing

kiln-controller.py

@@ -111,6 +111,7 @@ def handle_control():
     while True:
         try:
             message = wsock.receive()
+            if message:
                 log.info("Received (control): %s" % message)
                 msgdict = json.loads(message)
                 if msgdict.get("cmd") == "RUN":
@@ -135,7 +136,8 @@ def handle_control():
                 elif msgdict.get("cmd") == "STOP":
                     log.info("Stop command received")
                     oven.abort_run()
-        except WebSocketError:
+        except WebSocketError as e:
+            log.error(e)
             break
     log.info("websocket (control) closed")