fix #4152. and clean up imports

plugins/ledger/qt.py

@@ -1,15 +1,13 @@
-import threading
-
-from PyQt5.Qt import QInputDialog, QLineEdit, QVBoxLayout, QLabel
+#from btchip.btchipPersoWizard import StartBTChipPersoDialog
 
 from electrum.i18n import _
 from electrum.plugins import hook
 from electrum.wallet import Standard_Wallet
+from electrum_gui.qt.util import *
+
 from .ledger import LedgerPlugin
 from ..hw_wallet.qt import QtHandlerBase, QtPluginBase
-from electrum_gui.qt.util import *
 
-#from btchip.btchipPersoWizard import StartBTChipPersoDialog
 
 class Plugin(LedgerPlugin, QtPluginBase):
     icon_unpaired = ":icons/ledger_unpaired.png"
@@ -77,11 +75,7 @@ class Ledger_Handler(QtHandlerBase):
         return 
         
     def setup_dialog(self):
+        self.show_error(_('Initialization of Ledger HW devices is currently disabled.'))
+        return
         dialog = StartBTChipPersoDialog()
         dialog.exec_()
-
-
-        
-        
-        
-