qt: wizard: xpub can be None, fixes #10109

Author: accumulator

electrum/gui/qt/wizard/wallet.py

@@ -1425,7 +1425,8 @@ def get_xpub_task(_client, _derivation, _xtype):
             except Exception as e:
                 self.error = repr(e)  # TODO: handle user interaction exceptions (e.g. invalid pin) more gracefully
                 self.logger.exception(repr(e))
-            self.logger.debug(f'Done retrieve xpub: {self.xpub[:10]}...{self.xpub[-5:]}')
+            if self.xpub:
+                self.logger.debug(f'Done retrieve xpub: {self.xpub[:10]}...{self.xpub[-5:]}')
             self.busy = False
             self.validate()