includeAudio & sharing intent issue (iOS)

This issue is related to iOS only.

My app is taking file from sharing intent ([example](https://pub.dev/packages/receive_sharing_intent/example)) and compressing it using video_compress library. If `includeAudio=true` everything works as expected. But when it is `false` compression fails with error:

```
flutter: Invalid argument(s) (path): Must not be null
```

During debugging in Xcode I have found that json object in line below has only one field "isCancel":

https://github.com/jonataslaw/VideoCompress/blob/ce37a595c218a271fcde150d0d29a4bb5270ca7b/ios/Classes/SwiftVideoCompressPlugin.swift#L243

And this is happening because below line hits `return`:

https://github.com/jonataslaw/VideoCompress/blob/ce37a595c218a271fcde150d0d29a4bb5270ca7b/ios/Classes/SwiftVideoCompressPlugin.swift#L98