parse series credits, fixes #3174

ox/web/imdb.py

@@ -559,6 +559,17 @@ class Imdb(SiteParser):
             if not self['credits']:
                 del self['credits']
 
+        if 'credits' in self:
+            for key, deparment in (
+                ('director', 'Series Directed'),
+                ('writer', 'Series Writing Credits'),
+                ('cinematographer', 'Series Cinematography'),
+            ):
+                if key not in self:
+                    series_credit = [c for c in self['credits'] if c.get('deparment') == deparment]
+                    if series_credit:
+                        self[key] = [c['name'] for c in series_credit]
+
 class ImdbCombined(Imdb):
     def __init__(self, id, timeout=-1):
         _regex = {}