IDL: Use implicit false in compute_info_individual()

Source/bindings/scripts/compute_interfaces_info_individual.py

 #!/usr/bin/python
 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 131 matching lines @@
                                    this_include_path=None):
         paths_dict = self.partial_interface_files[partial_interface_name]
         paths_dict['full_paths'].append(full_path)
         if this_include_path:
             paths_dict['include_paths'].append(this_include_path)
 
     def collect_info(self, idl_filename):
         """Reads an idl file and collects information which is required by the
         binding code generation."""
         definitions = self.reader.read_idl_file(idl_filename)
-        if len(definitions.interfaces) > 0:
+        if definitions.interfaces:
             definition = next(definitions.interfaces.itervalues())
             interface_info = {
                 'is_callback_interface': definition.is_callback,
                 'is_dictionary': False,
                 # Interfaces that are referenced (used as types) and that we
                 # introspect during code generation (beyond interface-level
                 # data ([ImplementedAs], is_callback_interface, ancestors, and
                 # inherited extended attributes): deep dependencies.
                 # These cause rebuilds of referrers, due to the dependency,
                 # so these should be minimized; currently only targets of
                 # [PutForwards].
                 'referenced_interfaces': get_put_forward_interfaces_from_definition(definition),
             }
-        elif len(definitions.dictionaries) > 0:
+        elif definitions.dictionaries:
             definition = next(definitions.dictionaries.itervalues())
             interface_info = {
                 'is_callback_interface': False,
                 'is_dictionary': True,
                 'referenced_interfaces': None,
             }
         else:
             raise Exception('IDL file must contain one interface or dictionary')
 
         extended_attributes = definition.extended_attributes
@@ skipping 57 matching lines @@
     for idl_filename in idl_files:
         info_collector.collect_info(idl_filename)
 
     write_pickle_file(options.interfaces_info_file,
                       info_collector.get_info_as_dict(),
                       options.write_file_only_if_changed)
 
 
 if __name__ == '__main__':
     sys.exit(main())