remove default log handler in workspace loader

vispa/workspace_loader.py

@@ -297,8 +297,10 @@ def main_loop(fin, fout):
     vispa.remote.log = rpyc.async(vispa.remote.connection.root.log)
     vispa.remote.send = rpyc.async(vispa.remote.connection.root.send)
 
+    exising_handlers = []
     try:
-        logging.getLogger().addHandler(RemoteHandler(vispa.remote.log))
+        exising_handlers = logging.getLogger().handlers
+        logging.getLogger().handlers = [RemoteHandler(vispa.remote.log)]
         logger.info("connected, serving")
     except:
         logger.exception("main_loop")
@@ -317,7 +319,7 @@ def main_loop(fin, fout):
             if not vispa.remote.connection.closed:
                 raise
     finally:
-        logging.getLogger().handlers = []
+        logging.getLogger().handlers = exising_handlers
         vispa.remote.connection.close()
 
     logger.debug("daemon done")