Fixes Caterpillar crashing while generating report.

src/report/report.py

 #!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 
 # Copyright 2016 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
@@ skipping 352 matching lines @@
 
   Args:
     dependencies: List of dependency names.
     directory: Directory to install dependencies into.
   """
   for dependency in dependencies:
     caterpillar.install_dependency(['bower', 'install', dependency], directory)
 
 
 def generate_and_write(report_dir, chrome_app_manifest, apis, status, warnings,
-                       pwa_path):
+                       web_path, boilerplate_dir):
   """Generates a conversion report and writes it to a directory.
 
   Args:
     report_dir: Directory to write report to.
     chrome_app_manifest: Manifest dictionary of input Chrome App.
     apis: Dictionary mapping Chrome Apps API name to polyfill manifest
       dictionaries.
     status: Status representing conversion status of the entire app.
     warnings: List of general warnings logged during conversion.
-    pwa_path: Path to output progressive web app.
+    web_path: Path to output progressive web app.
+    boilerplate_dir: Boilerplate directory relative to the output directory.
   """
-  report = generate(chrome_app_manifest, apis, status, warnings, pwa_path)
+  report = generate(chrome_app_manifest, apis, status, warnings, web_path,
+                    boilerplate_dir)
   report_path = os.path.join(report_dir, 'report.html')
   with open(report_path, 'w') as report_file:
     logging.info('Writing conversion report to `%s`.', report_path)
     report_file.write(surrogateescape.encode(report))
   copy_css(report_dir)
   install_bower_dependencies(['lato', 'inconsolata', 'code-prettify'],
                              report_dir)