Make sure subprocess calls don`t ignore result codes indicating errors. Fix JS docs generation whil…

sitescripts/management/bin/updateExternalFiles.py

 # coding: utf-8
 
 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-2013 Eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
@@ skipping 25 matching lines @@
       if not os.path.exists(path):
         os.makedirs(path)
 
       path = os.path.join(path, filename)
       exists = os.path.exists(path)
       file = codecs.open(path, 'wb', encoding='utf-8')
       data = urllib.urlopen(setting['source']).read().decode('utf-8')
       file.write(data)
       file.close()
 
-      message = 'Updated copy of external file %s'
-      if not exists:
-        message = 'Added copy of external file %s'
-      subprocess.check_call(['hg', 'commit', '-q', '-A', '-R', tempdir, '-u', 'hgbot', '-m', message % filename])
-
-      # Don't check the result of this call, it will be 1 if nothing needs pushing
-      subprocess.call(['hg', 'push', '-q', '-R', tempdir])
+      if subprocess.check_output(['hg', 'stat', '-R', tempdir]) != '':
+        message = 'Updated copy of external file %s'
+        if not exists:
+          message = 'Added copy of external file %s'
+        subprocess.check_call(['hg', 'commit', '-q', '-A', '-R', tempdir, '-u', 'hgbot', '-m', message % filename])
+        subprocess.call(['hg', 'push', '-q', '-R', tempdir])
     finally:
       rmtree(tempdir)
 
 def readSettings():
   result = {}
   for option, value in get_config().items('externalFiles'):
     if option.find('_') < 0:
       continue
     name, setting = option.rsplit('_', 2)
     if not setting in ('source', 'targetrepository', 'targetfile'):
       continue
 
     if not name in result:
       result[name] = {
         'source': None,
         'targetrepository': None,
         'targetfile': None
       }
     result[name][setting] = value
   return result
 
 if __name__ == '__main__':
   setupStderr()
   updateExternalFiles()