This function throws an error:
```
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "./youtube-dl/__main__.py", line 18, in <module>
  File "./youtube-dl/youtube_dl/__init__.py", line 670, in main
    
  File "./youtube-dl/youtube_dl/__init__.py", line 654, in _real_main
    
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 571, in download
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 321, in extract_info
  File "./youtube-dl/youtube_dl/extractor/common.py", line 103, in extract
  File "./youtube-dl/youtube_dl/extractor/websurg.py", line 57, in _real_extract
  File "./youtube-dl/youtube_dl/extractor/common.py", line 301, in _og_search_title
  File "./youtube-dl/youtube_dl/extractor/common.py", line 292, in _og_search_property
  File "./youtube-dl/youtube_dl/utils.py", line 474, in unescapeHTML
AssertionError
```