backend: Recover from error during enter_fsm()

backend/monsun_backend/command_execution.py

@@ -95,6 +95,9 @@ def worker_process(
             connected = False
             time.sleep(serial_reconnection_wait_timeout)
             logger.warning("reconnecting...")
+        except Exception as e:
+            logger.exception(e)
+            logger.error("Unexpected exception happened, recovering...")
 
 
 def enter_fsm(