Merge pull request #1350 from Jaiz909/description-keyerror-fix

Fixed issue #1277 KeyError when no description.

diff --cc youtube_dl/YoutubeDL.py
index b289bd9e26bbc9993e6f1295a31d20b3275f5f48,afce280407121fdf0e1680ea7c0a7e4ec2b5d0ec..c2f992b8e00f333f59da38ffd59153183d057281
--- 1/youtube_dl/YoutubeDL.py
--- 2/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@@ -492,6 -492,8 +492,8 @@@ class YoutubeDL(object)
                  self.report_writedescription(descfn)
                  with io.open(encodeFilename(descfn), 'w', encoding='utf-8') as descfile:
                      descfile.write(info_dict['description'])
 -                self.report_warning(u'Cannot extract description.')
+             except (KeyError, TypeError):
++                self.report_warning(u'There\'s no description to write.')
              except (OSError, IOError):
                  self.report_error(u'Cannot write description file ' + descfn)
                  return