Fixes upload fails for non-existent partner video upload to S3 (#2849)

Previously, the S3 upload flow attempted to upload a partner video regardless
of its existence, resulting in an error when the video was missing. This error
prevented the job responsible for uploading the original variant to S3 from
completing successfully.

This commit adds a check to ensure the partner video exists before attempting
to upload, resolving the issue and allowing the job to complete as expected.

app/Jobs/UploadSizeVariantToS3Job.php

@@ -86,6 +86,10 @@ private function handleVideoPartner(): void
 
 		$photo = Photo::query()->where('id', '=', $this->variant->photo_id)->first();
 
+		if ($photo->live_photo_short_path === null) {
+			return;
+		}
+
 		Storage::disk(StorageDiskType::S3->value)->writeStream(
 			$photo->live_photo_short_path,
 			Storage::disk(StorageDiskType::LOCAL->value)->readStream($photo->live_photo_short_path)