Fix KeyError: 'fallback_url'

redditbot.py

@@ -293,7 +293,8 @@ async def main():
                             url = None
                             break
                     else:
-                        url = reddit_video['fallback_url']
+                        if 'fallback_url' in reddit_video:
+                            url = reddit_video['fallback_url']
                 elif getattr(random_post, 'is_gallery', None):
                     files = []
                     captions = []
@@ -352,12 +353,15 @@ async def main():
                         gfyitem = apidata.get('gfyItem')
                         if gfyitem:
                             url = gfyitem.get('mp4Url', url)
-                    elif random_post.is_reddit_media_domain and splitted[1] == '.gif' and preview:
-                        preview = preview['images'][0]['variants']
-                        for i in ('mp4', 'gif'):
-                            if i in preview:
-                                url = preview[i]['source']['url']
-                                break
+                    elif random_post.is_reddit_media_domain and preview:
+                        ppreview = preview['images'][0]
+                        if splitted[1] == '.gif':
+                            for i in ('mp4', 'gif'):
+                                if i in ppreview['variants']:
+                                    url = ppreview['variants'][i]['source']['url']
+                                    break
+                        elif random_post.is_video:
+                            url = ppreview['source']['url']
                 if url:
                     url = urlunparse(urlparse(url, 'https'))
                     await _download_file(filename, url)