fix: ignore errors on closing client and kernels

spyder/plugins/remoteclient/plugin.py

@@ -116,7 +116,10 @@ def on_first_registration(self):
     def on_close(self, cancellable=True):
         """Stops remote server and close any opened connection."""
         for client in self._remote_clients.values():
-            AsyncDispatcher(client.close, early_return=False)()
+            try:
+                AsyncDispatcher(client.close, early_return=False)()
+            except Exception:
+                pass
 
     @on_plugin_available(plugin=Plugins.MainMenu)
     def on_mainmenu_available(self):
@@ -313,7 +316,10 @@ async def _shutdown_kernel(self, config_id, kernel_id):
         """Shutdown a running kernel."""
         if config_id in self._remote_clients:
             client = self._remote_clients[config_id]
-            await client.terminate_kernel(kernel_id)
+            try:
+                await client.terminate_kernel(kernel_id)
+            except Exception:
+                pass
 
     @AsyncDispatcher.dispatch(loop='asyncssh')
     async def _start_new_kernel(self, config_id):
@@ -329,7 +335,10 @@ async def _restart_kernel(self, config_id, kernel_id):
         """Restart kernel."""
         if config_id in self._remote_clients:
             client = self._remote_clients[config_id]
-            return await client.restart_kernel(kernel_id)
+            try:
+                return await client.restart_kernel(kernel_id)
+            except Exception:
+                pass
 
     @AsyncDispatcher.dispatch(loop='asyncssh')
     async def _interrupt_kernel(self, config_id, kernel_id):

spyder/plugins/remoteclient/widgets/container.py

@@ -27,7 +27,7 @@
 
 class RemoteClientContainer(PluginMainContainer):
 
-    _sig_kernel_restarted = Signal(object, bool)
+    _sig_kernel_restarted = Signal(object, object)
     """
     This private signal is used to inform that a kernel restart took place in
     the server.
@@ -37,8 +37,9 @@ class RemoteClientContainer(PluginMainContainer):
     ipyclient: ClientWidget
         An IPython console client widget (the first parameter in both
         signatures).
-    response: bool
-        Response returned by the server.
+    response: bool or None
+        Response returned by the server. `None` can happen when the connection
+        to the server is lost.
     """
 
     sig_start_server_requested = Signal(str)