[crunchyroll] Extract season name

youtube_dl/extractor/crunchyroll.py

@@ -177,6 +177,7 @@ class CrunchyrollIE(CrunchyrollBaseIE):
             'uploader': 'Kadokawa Pictures Inc.',
             'upload_date': '20170118',
             'series': "KONOSUBA -God's blessing on this wonderful world!",
+            'season': "KONOSUBA -God's blessing on this wonderful world! 2",
             'season_number': 2,
             'episode': 'Give Me Deliverance from this Judicial Injustice!',
             'episode_number': 1,
@@ -222,6 +223,23 @@ class CrunchyrollIE(CrunchyrollBaseIE):
             # just test metadata extraction
             'skip_download': True,
         },
+    }, {
+        # A video with a vastly different season name compared to the series name
+        'url': 'http://www.crunchyroll.com/nyarko-san-another-crawling-chaos/episode-1-test-590532',
+        'info_dict': {
+            'id': '590532',
+            'ext': 'mp4',
+            'title': 'Haiyoru! Nyaruani (ONA) Episode 1 – Test',
+            'description': 'Mahiro and Nyaruko talk about official certification.',
+            'uploader': 'TV TOKYO',
+            'upload_date': '20120305',
+            'series': 'Nyarko-san: Another Crawling Chaos',
+            'season': 'Haiyoru! Nyaruani (ONA)',
+        },
+        'params': {
+            # Just test metadata extraction
+            'skip_download': True,
+        },
     }]
 
     _FORMAT_IDS = {
@@ -491,7 +509,8 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
         # webpage provide more accurate data than series_title from XML
         series = self._html_search_regex(
             r'id=["\']showmedia_about_episode_num[^>]+>\s*<a[^>]+>([^<]+)',
-            webpage, 'series', default=xpath_text(metadata, 'series_title'))
+            webpage, 'series', fatal=False)
+        season = xpath_text(metadata, 'series_title')
 
         episode = xpath_text(metadata, 'episode_title')
         episode_number = int_or_none(xpath_text(metadata, 'episode_number'))
@@ -508,6 +527,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
             'uploader': video_uploader,
             'upload_date': video_upload_date,
             'series': series,
+            'season': season,
             'season_number': season_number,
             'episode': episode,
             'episode_number': episode_number,