fix pylint warnings

native_client_sdk/src/project_templates/init_project.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """A simple project generator for Native Client projects written in C or C++.
 
 This script accepts a few argument which it uses as a description of a new NaCl
 project.  It sets up a project with a given name and a given primary language
 (default: C++, optionally, C) using the appropriate files from this area.
@@ skipping 261 matching lines @@
       is_vs_project: A boolean indicating whether this project has Visual
         Studio support.
       project_name: A string containing the name of the project to be created.
       project_location: A path indicating where the new project is to be placed.
       project_templates_dir: The path to the project_templates directory.
       os_resource: A resource to be used as os.  Provided for unit testing.
     """
     self.__is_c_project = is_c_project
     self.__is_vs_project = is_vs_project
     self.__project_files = []
+    self.__project_dir = None
     self.__project_name = project_name
     self.__project_location = project_location
     self.__nacl_platform = nacl_platform
     self.__project_templates_dir = project_templates_dir
     # System resources are properties so mocks can be inserted.
     self.__fileinput = fileinput
     self.__nacl_sdk_root = nacl_sdk_root
     self.__os = os_resource
     self.__shutil = shutil
     self.__sys = sys
@@ skipping 203 matching lines @@
   project_initializer.PrepareFileContent()
   return 0
 
 
 if __name__ == '__main__':
   try:
     sys.exit(main(sys.argv[1:]))
   except Exception as error:
     print error
     sys.exit(1)