BF: When changing log target with python2.{4,5} handle KeyError

server/server.py

@@ -379,7 +379,7 @@ class Server:
 				try:
 					handler.flush()
 					handler.close()
-				except ValueError:
+				except (ValueError, KeyError):
 					if sys.version_info >= (2,6):
 						raise
 					# is known to be thrown after logging was shutdown once