Two bugfixes in tools/create_editor.py

tools/create_editor.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 # A script which will be invoked from gyp to create a build of the editor.
 #
 # Usage: ./tools/create_editor.py
 #            [--mode <mode>] [--arch <arch>] [--out <output>] [--build <build>]
@@ skipping 29 matching lines @@
 def AntPath():
   parent = join('third_party', 'apache_ant', '1.8.4', 'bin')
   if utils.IsWindows():
     return join(parent, 'ant.bat')
   else:
     return join(parent, 'ant')
 
 
 def ProcessEditorArchive(archive, outDir):
   tempDir = join(GetEditorTemp(), 'editor.out')
-  os.makedirs(tempDir)
+  try:
+    os.makedirs(tempDir)
+  except OSError:
+    # Directory already exists.
+    pass
 
   if utils.IsWindows():
     f = zipfile.ZipFile(archive)
     f.extractall(tempDir)
+    f.close()
   else:
     subprocess.call(['unzip', '-q', archive, '-d', tempDir])
 
   for src in glob.glob(join(tempDir, 'dart', '*')):
     shutil.move(src, outDir)
 
   shutil.rmtree(tempDir)
   os.unlink(archive)
 
 
@@ skipping 121 matching lines @@
     ProcessEditorArchive(archives[0], OUTPUT)
 
   if os.path.exists(GetEditorTemp()):
     shutil.rmtree(GetEditorTemp())
 
   print('\nEditor build successful')
 
 
 if __name__ == '__main__':
   sys.exit(Main())