kivy: use InvalidPassword

gui/kivy/uix/dialogs/tx_dialog.py

@@ -7,6 +7,7 @@ from kivy.uix.label import Label
 
 from electrum_gui.kivy.i18n import _
 from datetime import datetime
+from electrum.util import InvalidPassword
 
 Builder.load_string('''
 
@@ -146,7 +147,10 @@ class TxDialog(Factory.Popup):
         Clock.schedule_once(lambda dt: self.__do_sign(password), 0.1)
 
     def __do_sign(self, password):
-        self.app.wallet.sign_transaction(self.tx, password)
+        try:
+            self.app.wallet.sign_transaction(self.tx, password)
+        except InvalidPassword:
+            self.app.show_error(_("Invalid PIN"))
         self.update()
 
     def do_broadcast(self):

gui/kivy/uix/screens.py

@@ -18,7 +18,7 @@ from kivy.lang import Builder
 from kivy.factory import Factory
 from kivy.utils import platform
 
-from electrum.util import profiler, parse_URI, format_time
+from electrum.util import profiler, parse_URI, format_time, InvalidPassword
 from electrum import bitcoin
 from electrum.util import timestamp_to_datetime
 from electrum.plugins import run_hook
@@ -283,9 +283,8 @@ class SendScreen(CScreen):
             self.app.show_info("Signing...")
         try:
             self.app.wallet.sign_transaction(tx, password)
-        except Exception as e:
-            traceback.print_exc(file=sys.stdout)
-            self.app.show_error(str(e))
+        except InvalidPassword:
+            self.app.show_error(_("Invalid PIN"))
             return
         if not tx.is_complete():
             self.app.tx_dialog(tx)