[arte] Always look for the JSON URL (Fixes #1002)

youtube_dl/extractor/arte.py

@@ -77,10 +77,6 @@ class ArteTvIE(InfoExtractor):
 
     def _extract_emission(self, url, video_id, lang):
         """Extract from www.arte.tv/guide"""
-        if video_id.replace('-','').isdigit():
-            json_url = 'http://org-www.arte.tv/papi/tvguide/videos/stream/player/F/%s_PLUS7-F/ALL/ALL.json' % video_id
-        else:
-            # We don't know the real id of the video, we have to search in the webpage
         webpage = self._download_webpage(url, video_id)
         json_url = self._html_search_regex(r'arte_vp_url="(.*?)"', webpage, 'json url')