Tiny, urgent fix for rebaseline_server to accept new baselines.

gm/rebaseline_server/results.py

 #!/usr/bin/python
 
 """
 Copyright 2013 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Repackage expected/actual GM results as needed by our HTML rebaseline viewer.
 """
@@ skipping 220 matching lines @@
     for dirpath, dirnames, filenames in os.walk(root):
       for matching_filename in fnmatch.filter(filenames, pattern):
         builder = os.path.basename(dirpath)
         # We should never encounter Trybot *expectations*, but if we are
         # writing into the actual-results dir, skip the Trybot actuals.
         # (I don't know why we would ever write into the actual-results dir,
         # though.)
         if builder.endswith('-Trybot'):
           continue
         per_builder_dict = meta_dict.get(builder)
-        if per_builder_dict:
+        if per_builder_dict is not None:
           fullpath = os.path.join(dirpath, matching_filename)
           gm_json.WriteToFile(per_builder_dict, fullpath)
           actual_builders_written.append(builder)
 
     # Check: did we write out the set of per-builder dictionaries we
     # expected to?
     expected_builders_written = sorted(meta_dict.keys())
     actual_builders_written.sort()
     if expected_builders_written != actual_builders_written:
       raise KeyError(
@@ skipping 224 matching lines @@
       category_dict: category dict-of-dicts to modify
       category_name: category name, as a string
       category_values: list of values we want to make sure are represented
                        for this category
     """
     if not category_dict.get(category_name):
       category_dict[category_name] = {}
     for category_value in category_values:
       if not category_dict[category_name].get(category_value):
         category_dict[category_name][category_value] = 0