qml: sweep: just use wallet.get_receiving_address()

electrum/gui/qml/qetxfinalizer.py

@@ -900,15 +900,7 @@ class QETxSweepFinalizer(QETxFinalizer):
             self.privateKeysChanged.emit()
 
     def make_sweep_tx(self):
-        addresses = self._wallet.wallet.get_unused_addresses()
-        if not addresses:
-            try:
-                addresses = self._wallet.wallet.get_receiving_addresses()
-            except AttributeError:
-                addresses = self._wallet.wallet.get_addresses()
-
-        assert len(addresses) > 0, 'no address in wallet to send to'
-        address = addresses[0]
+        address = self._wallet.wallet.get_receiving_address()
         assert self._wallet.wallet.adb.is_mine(address)
 
         coins, keypairs = copy.deepcopy(self._txins)