Fix device-selected handlers

The device argument is actually optional.

blueman/gui/DeviceSelectorDialog.py

@@ -25,7 +25,7 @@ def __init__(self, title: str = _("Select Device"), parent: Optional[Gtk.Contain
         self.selector = DeviceSelectorWidget(adapter_name=adapter_name, visible=True)
         self.vbox.pack_start(self.selector, True, True, 0)
 
-        self.selection: Optional[Tuple[str, Device]] = None
+        self.selection: Optional[Tuple[str, Optional[Device]]] = None
 
         self.selector.List.connect("device-selected", self.on_device_selected)
         self.selector.List.connect("adapter-changed", self.on_adapter_changed)
@@ -45,6 +45,6 @@ def on_row_activated(self, _treeview: Gtk.TreeView, _path: Gtk.TreePath, _view_c
     def on_adapter_changed(self, _devlist: DeviceList, _adapter: str) -> None:
         self.selection = None
 
-    def on_device_selected(self, devlist: DeviceList, device: Device, _tree_iter: Gtk.TreeIter) -> None:
+    def on_device_selected(self, devlist: DeviceList, device: Optional[Device], _tree_iter: Gtk.TreeIter) -> None:
         assert devlist.Adapter is not None
         self.selection = (devlist.Adapter.get_object_path(), device)

blueman/gui/manager/ManagerMenu.py

@@ -154,7 +154,7 @@ def _on_settings_changed(self, settings: Gio.Settings, key: str) -> None:
             logging.debug("refilter")
             self.blueman.List.filter.refilter()
 
-    def on_device_selected(self, _lst: ManagerDeviceList, device: Device, tree_iter: Gtk.TreeIter) -> None:
+    def on_device_selected(self, _lst: ManagerDeviceList, device: Optional[Device], tree_iter: Gtk.TreeIter) -> None:
         if tree_iter and device:
             self.item_device.props.sensitive = True
 

blueman/gui/manager/ManagerToolbar.py

@@ -66,8 +66,13 @@ def on_adapter_changed(self, _lst: ManagerDeviceList, adapter_path: Optional[str
         logging.debug(f"toolbar adapter {adapter_path}")
         self._update_buttons(None if adapter_path is None else Adapter(obj_path=adapter_path))
 
-    def on_device_selected(self, dev_list: ManagerDeviceList, device: Device, _tree_iter: Gtk.TreeIter) -> None:
-        self._update_buttons(Adapter(obj_path=device["Adapter"]))
+    def on_device_selected(
+        self,
+        dev_list: ManagerDeviceList,
+        device: Optional[Device],
+        _tree_iter: Gtk.TreeIter,
+    ) -> None:
+        self._update_buttons(None if device is None else Adapter(obj_path=device["Adapter"]))
 
     def _update_buttons(self, adapter: Optional[Adapter]) -> None:
         powered = adapter is not None and adapter["Powered"]