[arte] fix arte concert (a fields has been removed fron json)

modules/arte/browser.py

@@ -142,6 +142,7 @@ class ArteBrowser(PagesBrowser):
         if m:
             video = self.webservice.go(__site=m.group('__site'), _lang=m.group('_lang'),
                                        _id=m.group('_id')).get_arte_concert_video(obj=video)
+            video.id = u'%s.%s' % (video._site, id)
             video.ext, video.url = self.get_url()
             return video
 

modules/arte/pages.py

@@ -230,7 +230,6 @@ class ArteJsonPage(JsonPage):
 
         klass = ArteSiteVideo
         obj__site = SITE.CONCERT.get('id')
-        obj_id = Format('%s.%s', Field('_site'), Regexp(Dict('VTR'), 'http://concert.arte.tv(.*)'))
 
     @method
     class get_arte_cinema_video(ArteItemElement):