qml: handle exception more gracefully when attempting to delete last address from imported wallet

electrum/gui/qml/components/AddressDetails.qml

@@ -315,9 +315,11 @@ Pane {
                         yesno: true
                     })
                     confirmdialog.accepted.connect(function () {
-                        addressdetails.deleteAddress()
-                        addressDeleted()
-                        app.stack.pop()
+                        var success = addressdetails.deleteAddress()
+                        if (success) {
+                            addressDeleted()
+                            app.stack.pop()
+                        }
                     })
                     confirmdialog.open()
                 }
@@ -335,5 +337,11 @@ Pane {
         onAuthRequired: (method, authMessage) => {
             app.handleAuthRequired(addressdetails, method, authMessage)
         }
+        onAddressDeleteFailed: (message) => {
+            var dialog = app.messageDialog.createObject(root, {
+                text: message
+            })
+            dialog.open()
+        }
     }
 }

electrum/gui/qml/qeaddressdetails.py

@@ -1,6 +1,7 @@
 from PyQt6.QtCore import pyqtProperty, pyqtSignal, pyqtSlot, QObject
 
 from electrum.logging import get_logger
+from electrum.util import UserFacingException
 
 from .auth import auth_protect, AuthMixin
 from .qetransactionlistmodel import QETransactionListModel
@@ -12,6 +13,7 @@ class QEAddressDetails(AuthMixin, QObject):
     _logger = get_logger(__name__)
 
     detailsChanged = pyqtSignal()
+    addressDeleteFailed = pyqtSignal([str], arguments=['message'])
 
     def __init__(self, parent=None):
         super().__init__(parent)
@@ -84,7 +86,6 @@ class QEAddressDetails(AuthMixin, QObject):
     def canDelete(self):
         return self._candelete
 
-
     frozenChanged = pyqtSignal()
     @pyqtProperty(bool, notify=frozenChanged)
     def isFrozen(self):
@@ -131,10 +132,15 @@ class QEAddressDetails(AuthMixin, QObject):
 
         self.detailsChanged.emit()
 
-    @pyqtSlot()
+    @pyqtSlot(result=bool)
     def deleteAddress(self):
         assert self.canDelete
-        self._wallet.wallet.delete_address(self._address)
+        try:
+            self._wallet.wallet.delete_address(self._address)
+        except UserFacingException as e:
+            self.addressDeleteFailed.emit(str(e))
+            return False
+        return True
 
     def update(self):
         if self._wallet is None: