fix

client/gui_qt.py

@@ -425,6 +425,7 @@ class ElectrumWindow(QMainWindow):
         msg = 'Your wallet is encrypted. Use this dialog to change the password.\n To disable wallet encryption, enter an empty new password.' if self.wallet.use_encryption else 'Your wallet keys are not encrypted'
         grid.addWidget(QLabel(msg), 0, 0, 1, 2)
 
+        if self.wallet.use_encryption:
             grid.addWidget(QLabel('Password'), 1, 0)
             grid.addWidget(pw, 1, 1)
 
@@ -446,8 +447,7 @@ class ElectrumWindow(QMainWindow):
 
         if not d.exec_(): return
 
-        password = str(pw.text())
-        print password
+        password = str(pw.text()) if self.wallet.use_encryption else None
         new_password = str(new_pw.text())
         new_password2 = str(conf_pw.text())
 

client/wallet.py

@@ -767,5 +767,5 @@ class Wallet:
             a = self.imported_keys[k]
             b = self.pw_decode(a, password)
             c = self.pw_encode(b, new_password)
-            self.wallet.imported_keys[k] = c
-        self.wallet.save()
+            self.imported_keys[k] = c
+        self.save()