Fix a case 'submatched_dict' may include a key with None value.

tools/deep_memory_profiler/dmprof.py

 # 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.
 
 """The deep heap profiler script for Chrome."""
 
 import copy
 import datetime
 import json
 import logging
@@ skipping 1018 matching lines @@
           submatched = self._OLD_HOOKED_PATTERN.match(matched.group(8))
       elif matched.group(7) == 'unhooked':
         submatched = self._UNHOOKED_PATTERN.match(matched.group(8))
         if not submatched:
           submatched = self._OLD_UNHOOKED_PATTERN.match(matched.group(8))
       else:
         assert matched.group(7) in ['hooked', 'unhooked']
 
       submatched_dict = submatched.groupdict()
       region_info = { 'vma': current_vma }
-      if 'TYPE' in submatched_dict:
+      if submatched_dict.get('TYPE'):
         region_info['type'] = submatched_dict['TYPE'].strip()
-      if 'COMMITTED' in submatched_dict:
+      if submatched_dict.get('COMMITTED'):
         region_info['committed'] = int(submatched_dict['COMMITTED'])
-      if 'RESERVED' in submatched_dict:
+      if submatched_dict.get('RESERVED'):
         region_info['reserved'] = int(submatched_dict['RESERVED'])
-      if 'BUCKETID' in submatched_dict:
+      if submatched_dict.get('BUCKETID'):
         region_info['bucket_id'] = int(submatched_dict['BUCKETID'])
 
       self._map[(int(matched.group(2), 16),
                  int(matched.group(5), 16))] = (matched.group(7), region_info)
       ln += 1
 
   def _extract_stacktrace_lines(self, line_number):
     """Extracts the position of stacktrace lines.
 
     Valid stacktrace lines are stored into self._stacktrace_lines.
@@ skipping 838 matching lines @@
     errorcode = COMMANDS[action]().do(sys.argv)
   except ParsingException, e:
     errorcode = 1
     sys.stderr.write('Exit by parsing error: %s\n' % e)
 
   return errorcode
 
 
 if __name__ == '__main__':
   sys.exit(main())