Not fail on non-valid gallery images

redditbot.py

@@ -298,11 +298,12 @@ async def main():
                     files = []
                     captions = []
                     for a, i in enumerate(random_post.media_metadata):
-                        captions.append(f'{text}\n#{a + 1}')
-                        filename = os.path.join(tempdir, str(time.time()))
                         i = random_post.media_metadata[i]
-                        await _download_file(filename, i['s']['u'])
-                        files.append(filename)
+                        if i['status'] == 'valid':
+                            filename = os.path.join(tempdir, str(time.time()))
+                            await _download_file(filename, i['s']['u'])
+                            captions.append(f'{text}\n#{a + 1}')
+                            files.append(filename)
                     url = None
                 if url:
                     parsed = list(urlparse(url))