[aparat] Fix extractor

Closes #2285

yt_dlp/extractor/aparat.py

@@ -33,19 +33,22 @@ class AparatIE(InfoExtractor):
         'only_matching': True,
     }]
 
+    def _parse_options(self, webpage, video_id, fatal=True):
+        return self._parse_json(self._search_regex(
+            r'options\s*=\s*({.+?})\s*;', webpage, 'options', default='{}'), video_id)
+
     def _real_extract(self, url):
         video_id = self._match_id(url)
 
-        # Provides more metadata
+        # If available, provides more metadata
         webpage = self._download_webpage(url, video_id, fatal=False)
+        options = self._parse_options(webpage, video_id, fatal=False)
 
-        if not webpage:
+        if not options:
             webpage = self._download_webpage(
                 'http://www.aparat.com/video/video/embed/vt/frame/showvideo/yes/videohash/' + video_id,
-                video_id)
-
-        options = self._parse_json(self._search_regex(
-            r'options\s*=\s*({.+?})\s*;', webpage, 'options'), video_id)
+                video_id, 'Downloading embed webpage')
+            options = self._parse_options(webpage, video_id)
 
         formats = []
         for sources in (options.get('multiSRC') or []):