qml: fix send "flow with LN but not LN enabled AND having bip21 uri"

closes https://github.com/spesmilo/electrum/issues/8334

electrum/gui/qml/qeinvoice.py

@@ -1,5 +1,5 @@
 import threading
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING, Optional, Dict, Any
 import asyncio
 from urllib.parse import urlparse
 
@@ -552,7 +552,7 @@ class QEInvoiceParser(QEInvoice):
                         self.validationError.emit('no_lightning',_('Detected valid Lightning invoice, but Lightning not enabled for wallet and no fallback address found.'))
                 else:
                     self._logger.debug('flow with LN but not LN enabled AND having bip21 uri')
-                    self.setValidOnchainInvoice(bip21['address'])
+                    self._validateRecipient_bip21_onchain(bip21)
             else:
                 self.setValidLightningInvoice(lninvoice)
                 if not self._wallet.wallet.lnworker.channels:
@@ -561,6 +561,9 @@ class QEInvoiceParser(QEInvoice):
                     self.validationSuccess.emit()
         else:
             self._logger.debug('flow without LN but having bip21 uri')
+            self._validateRecipient_bip21_onchain(bip21)
+
+    def _validateRecipient_bip21_onchain(self, bip21: Dict[str, Any]) -> None:
         if 'amount' not in bip21:
             amount = 0
         else: