Http status 404 not being handled at all

It just returns null (https://github.com/K1rakishou/Caching-Image-Loader/blob/master/src/main/java/http/DefaultHttpClient.kt#L57) but should return some status that should tell that the image was not found on the remote server.

Start in src/main/java/http/DefaultHttpClient.kt at line 57 and trace how an HTTP 404 response is represented and handled. Determine a status value that distinguishes a missing remote image from a null result, then verify that the 404 can be identified by the image-loading flow.

Written by the indexing model from the issue text.