Fix bug in ninja generator when there's no default action.

test/rules/gyptest-all.py

 #!/usr/bin/env python
 
 # Copyright (c) 2011 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Verifies simple rules when using an explicit build target of 'all'.
 """
 
 import TestGyp
 
 test = TestGyp.TestGyp()
 
+test.run_gyp('no_action_with_rules_fails.gyp', chdir='src/noaction', status=1,
+             stderr=None)
+
 test.run_gyp('actions.gyp', chdir='src')
 
 test.relocate('src', 'relocate/src')
 
 test.build('actions.gyp', test.ALL, chdir='relocate/src')
 
 expect = """\
 Hello from program.c
 Hello from function1.in
 Hello from function2.in
@@ skipping 32 matching lines @@
 Got 41.
 """
 
 if test.format == 'xcode':
   chdir = 'relocate/src/subdir4'
 else:
   chdir = 'relocate/src'
 test.run_built_executable('program4', chdir=chdir, stdout=expect)
 
 test.pass_test()