fix qt invoices list: handle lightning disabled

closes #5738

electrum/gui/qt/invoice_list.py

@@ -85,6 +85,7 @@ class InvoiceList(MyTreeView):
             return
         status_item = model.item(row, self.Columns.STATUS)
         status, status_str = get_request_status(req)
+        if self.parent.wallet.lnworker:
             log = self.parent.wallet.lnworker.logs.get(key)
             if log and status == PR_INFLIGHT:
                 status_str += '... (%d)'%len(log)
@@ -155,6 +156,7 @@ class InvoiceList(MyTreeView):
         menu.addAction(_("Details"), lambda: self.parent.show_invoice(key))
         if invoice['status'] == PR_UNPAID:
             menu.addAction(_("Pay"), lambda: self.parent.do_pay_invoice(invoice))
+        if self.parent.wallet.lnworker:
             log = self.parent.wallet.lnworker.logs.get(key)
             if log:
                 menu.addAction(_("View log"), lambda: self.show_log(key, log))