Many empty files for IPC in /.local/share/jupyter/runtime

🐛 Bug

Due this issue https://github.com/nteract/papermill/issues/511 around ports I changed configuration as c.KernelManager.transport = 'ipc' from tcp

This case made for server that I have many empty files for IPC in /.local/share/jupyter/runtime ,eg. like: kernel-fc84e21e-f923-489f-a537-d03f31f63401-ipc-1 kernel-fc84e21e-f923-489f-a537-d03f31f63401-ipc-2

Any opened notebook creating this file, and can't delete Could not delete /.local/share/jupyter/runtime/kernel-4dfsfsdfsfdsdsfdsffdsf-ipc-2: Invalid argument