qt history list: only offer "View Invoice" if still have invoice

fixes: #6343

electrum/gui/qt/history_list.py

@@ -675,7 +675,7 @@ class HistoryList(MyTreeView, AcceptFileDragDrop):
         tx_URL = block_explorer_URL(self.config, 'tx', tx_hash)
         tx_details = self.wallet.get_tx_info(tx)
         is_unconfirmed = tx_details.tx_mined_status.height <= 0
-        invoice_keys = self.wallet._get_relevant_invoice_keys_for_tx(tx)
+        invoice_keys = self.wallet.get_relevant_invoice_keys_for_tx(tx)
         menu = QMenu()
         if tx_details.can_remove:
             menu.addAction(_("Remove"), lambda: self.remove_local_tx(tx_hash))
@@ -701,7 +701,8 @@ class HistoryList(MyTreeView, AcceptFileDragDrop):
                     menu.addAction(_("Child pays for parent"), lambda: self.parent.cpfp(tx, child_tx))
         for key in invoice_keys:
             invoice = self.parent.wallet.get_invoice(key)
-            menu.addAction(_("View invoice"), lambda: self.parent.show_onchain_invoice(invoice))
+            if invoice:
+                menu.addAction(_("View invoice"), lambda: self.parent.show_onchain_invoice(invoice))
         if tx_URL:
             menu.addAction(_("View on block explorer"), lambda: webopen(tx_URL))
         menu.exec_(self.viewport().mapToGlobal(position))

electrum/wallet.py

@@ -764,11 +764,13 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
     def export_invoices(self, path):
         write_json_file(path, list(self.invoices.values()))
 
-    def _get_relevant_invoice_keys_for_tx(self, tx: Transaction) -> Set[str]:
+    def get_relevant_invoice_keys_for_tx(self, tx: Transaction) -> Set[str]:
         relevant_invoice_keys = set()
         for txout in tx.outputs():
             for invoice_key in self._invoices_from_scriptpubkey_map.get(txout.scriptpubkey, set()):
-                relevant_invoice_keys.add(invoice_key)
+                # note: the invoice might have been deleted since, so check now:
+                if invoice_key in self.invoices:
+                    relevant_invoice_keys.add(invoice_key)
         return relevant_invoice_keys
 
     def _prepare_onchain_invoice_paid_detection(self):
@@ -809,7 +811,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         tx_hash = tx.txid()
         with self.transaction_lock:
             labels = []
-            for invoice_key in self._get_relevant_invoice_keys_for_tx(tx):
+            for invoice_key in self.get_relevant_invoice_keys_for_tx(tx):
                 invoice = self.invoices.get(invoice_key)
                 if invoice is None: continue
                 assert isinstance(invoice, OnchainInvoice)