[tver] fix the code pointed out in flake8

youtube_dl/extractor/tver.py

@@ -1,19 +1,9 @@
 # coding: utf-8
 from __future__ import unicode_literals
 
-import csv
 import re
 
-from .common import InfoExtractor
 from .brightcove import BrightcoveNewIE
-from ..compat import (
-    compat_HTTPError,
-)
-from ..utils import (
-    ExtractorError,
-    js_to_json,
-    unsmuggle_url,
-)
 
 
 class TVerIE(BrightcoveNewIE):
@@ -119,15 +109,22 @@ class TVerIE(BrightcoveNewIE):
         # get video information
         info_dict = super(TVerIE, self)._real_extract(brightcove_url)
 
+        # get video description
+        description = \
+            self._og_search_description(webpage) or \
+            self._html_search_meta('twitter:description', webpage) or \
+            self._html_search_regex(r'<div class="description">(?P<description>.*?)</div>', webpage, 'description', default=None, flags=re.DOTALL)
+
         # undo _VALID_URL
         self._VALID_URL = _VALID_URL
 
-        # replacement
-        info_dict['id'] = video_id # TVer ID
-        info_dict['display_id'] = brightcove_video_id # Brightcove ID
-        info_dict['thumbnail'] = info_dict['thumbnail'].replace('160x90', '1920x1080') # select large thumbnail
-        info_dict['description'] = self._html_search_regex( # desctiption
-            r'<div class="description">(?P<description>.*?)</div>',
-            webpage, 'description', flags=re.DOTALL)
+        # TVer ID
+        info_dict['id'] = video_id
+        # Brightcove ID
+        info_dict['display_id'] = brightcove_video_id
+        # select large thumbnail
+        info_dict['thumbnail'] = info_dict['thumbnail'].replace('160x90', '1920x1080')
+        # desctiption
+        info_dict['description'] = description
 
         return info_dict