exception handler and bug fixes

katrain/core/engine.py

@@ -1,7 +1,7 @@
 import copy
 import json
 import subprocess
-import sys
+import traceback
 import threading
 import time
 from typing import Callable, Optional
@@ -157,7 +157,8 @@ class KataGoEngine:
                 if getattr(self.katrain, "update_state", None):  # easier mocking etc
                     self.katrain.update_state()
             except Exception as e:
-                self.katrain.log(f"Unexpected exception while processing KataGo output {line}", OUTPUT_ERROR)
+                traceback.print_exc(e)
+                self.katrain.log(f"Unexpected exception {e} while processing KataGo output {line}", OUTPUT_ERROR)
 
     def send_query(self, query, callback, error_callback, next_move=None):
         with self._lock: