qt ChannelsList: disable toolbar menu if `not wallet.has_lightning()`

closes https://github.com/spesmilo/electrum/issues/8321

electrum/gui/qt/channels_list.py

@@ -363,6 +363,9 @@ class ChannelsList(MyTreeView):
         menu.addAction(read_QIcon('update.png'), _('Submarine swap'), lambda: self.main_window.run_swap_dialog())
         menu.addSeparator()
         menu.addAction(_("Import channel backup"), lambda: self.main_window.do_process_from_text_channel_backup())
+        # only enable menu if has LN. Or we could selectively enable menu items?
+        #     and maybe add item "main_window.init_lightning_dialog()" when applicable
+        menu.setEnabled(self.wallet.has_lightning())
         self.new_channel_button = EnterButton(_('New Channel'), self.main_window.new_channel_dialog)
         self.new_channel_button.setEnabled(self.wallet.has_lightning())
         toolbar.insertWidget(2, self.new_channel_button)

electrum/gui/qt/main_window.py

@@ -1112,6 +1112,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
         if not self.network:
             self.show_error(_("You are offline."))
             return
+        if not self.wallet.lnworker:
+            self.show_error(_('Lightning is disabled'))
+            return
         if not self.wallet.lnworker.num_sats_can_send() and not self.wallet.lnworker.num_sats_can_receive():
             self.show_error(_("You do not have liquidity in your active channels."))
             return
@@ -2130,6 +2133,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
     def import_channel_backup(self, encrypted: str):
         if not self.question('Import channel backup?'):
             return
+        if not self.wallet.lnworker:
+            self.show_error(_('Lightning is disabled'))
+            return
         try:
             self.wallet.lnworker.import_channel_backup(encrypted)
         except Exception as e: