Don't crash in FileDownloader if subtitles couldn't be found and errors are ignored

youtube_dl/FileDownloader.py

@@ -485,6 +485,9 @@ class FileDownloader(object):
             subtitle = info_dict['subtitles'][0]
             (sub_error, sub_lang, sub) = subtitle
             sub_format = self.params.get('subtitlesformat')
+            if sub_error:
+                self.report_warning("Some error while getting the subtitles")
+            else:
                 try:
                     sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
                     self.report_writesubtitles(sub_filename)
@@ -501,6 +504,9 @@ class FileDownloader(object):
             sub_format = self.params.get('subtitlesformat')
             for subtitle in subtitles:
                 (sub_error, sub_lang, sub) = subtitle
+                if sub_error:
+                    self.report_warning("Some error while getting the subtitles")
+                else:
                     try:
                         sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
                         self.report_writesubtitles(sub_filename)