wizard: catch NotLegacySinglesigScriptType

Catch NetLegacySinglesigScriptType and convert it to a
UserFacingException if the user tries to import a private key for which
it is not possible to get a singlesig descriptor (e.g. p2wsh).

Fixes #10536

electrum/wizard.py

@@ -16,7 +16,7 @@ from electrum.storage import WalletStorage, StorageEncryptionVersion, StorageRea
 from electrum.util import UserFacingException
 from electrum.wallet_db import WalletDB
 from electrum.bip32 import normalize_bip32_derivation, xpub_type
-from electrum import keystore, mnemonic, bitcoin
+from electrum import descriptor, keystore, mnemonic, bitcoin
 from electrum.mnemonic import is_any_2fa_seed_type, can_seed_have_passphrase
 from electrum.util import multisig_type
 
@@ -702,7 +702,12 @@ class NewWalletWizard(KeystoreWizard):
                 for pk in keys:
                     assert bitcoin.is_private_key(pk)
                     txin_type, pubkey = k.import_privkey(pk, None)
-                    addr = bitcoin.pubkey_to_address(txin_type, pubkey)
+                    try:
+                        addr = bitcoin.pubkey_to_address(txin_type, pubkey)
+                    except descriptor.NotLegacySinglesigScriptType as e:
+                        raise UserFacingException(
+                            _("Importing individual private keys of type '{}' is not supported.").format(txin_type),
+                        ) from e
                     addresses[addr] = {'type': txin_type, 'pubkey': pubkey}
             elif 'address_list' in data:
                 for addr in data['address_list'].split():