do not show freeze/unfreeze channel options if channel is closed

electrum/gui/qt/channels_list.py

@@ -145,7 +145,7 @@ class ChannelsList(MyTreeView):
         cc = self.add_copy_menu(menu, idx)
         cc.addAction(_("Long Channel ID"), lambda: self.place_text_on_clipboard(channel_id.hex(),
                                                                                 title=_("Long Channel ID")))
-
+        if not chan.is_closed():
             if not chan.is_frozen_for_sending():
                 menu.addAction(_("Freeze (for sending)"), lambda: chan.set_frozen_for_sending(True))
             else:
@@ -155,7 +155,6 @@ class ChannelsList(MyTreeView):
             else:
                 menu.addAction(_("Unfreeze (for receiving)"), lambda: chan.set_frozen_for_receiving(False))
 
-
         funding_tx = self.parent.wallet.db.get_transaction(chan.funding_outpoint.txid)
         if funding_tx:
             menu.addAction(_("View funding transaction"), lambda: self.parent.show_transaction(funding_tx))