More multi-version support

ppapi/generators/idl_outfile.py

 #!/usr/bin/python
 #
 # Copyright (c) 2011 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.
 
 """ Output file objects for generator. """
 
 import difflib
 import os
@@ skipping 65 matching lines @@
 
   # Close the file
   def Close(self):
     filename = os.path.realpath(self.filename)
     self.open = False
     outtext = ''.join(self.outlist)
     if not self.always_write:
       if os.path.isfile(filename):
         intext = open(filename, 'r').read()
       else:
-        intext = None
+        intext = ''
 
       if IsEquivelent(intext, outtext):
         if GetOption('verbose'):
           InfoOut.Log('Output %s unchanged.' % self.filename)
         return False
 
     if GetOption('diff'):
       for line in difflib.unified_diff(intext.split('\n'), outtext.split('\n'),
                                      self.filename, 'NEW', n=1, lineterm=''):
         ErrOut.Log(line)
@@ skipping 68 matching lines @@
   errors += TestFile(filename, stringlist, force=False, update=False)
 
   # Test conditionally writing the file updating
   errors += TestFile(filename, stringlist + ['X'], force=False, update=True)
 
   # Clean up file
   os.remove(filename)
   if not errors: InfoOut.Log('All tests pass.')
   sys.exit(errors)