qml: add txid not empty assert to removeLocalTx. ref #8775

electrum/gui/qml/qetxdetails.py

@@ -442,8 +442,9 @@ class QETxDetails(QObject, QtEventListener):
     @pyqtSlot()
     @pyqtSlot(bool)
     def removeLocalTx(self, confirm=False):
-        assert self._can_remove
+        assert self._can_remove, 'cannot remove'
         txid = self._txid
+        assert txid, 'txid unset'
 
         if not confirm:
             num_child_txs = len(self._wallet.wallet.adb.get_depending_transactions(txid))