ImageProcessing::Error exception when upload has no extension

[danielmbrasil]

ImageProcessing raises an exception when a upload has no extension, then image is not processed and is deleted from cache later. The solution for this is discussed here.
The full error message in production logs was:

{"context":"Job raised exception","job":{"retry":true,"queue":"default","class":"PromoteJob","args":["MediaUploader::Attacher","Post",3764,"media",{"id":"post/media/0e6df95029c87473a8df9e2a9400deea","storage":"cache"}],"jid":"7c9131c6b94a9fac8755c525","created_at":1632801905.1634762,"enqueued_at":1632827658.9060004,"error_message":"Source format is multi-layer, but destination format is single-layer. If you care only about the first layer, add .loader(page: 0)to your pipeline. If you want to process each layer, see https://github.com/janko/image_processing/wiki/Splitting-a-PDF-into-multiple-images or use.saver(allow_splitting: true).","error_class":"ImageProcessing::Error","failed_at":1632801907.5167108,"retry_count":10,"retried_at":1632817575.1367998},"jobstr":"{\"retry\":true,\"queue\":\"default\",\"class\":\"PromoteJob\",\"args\":[\"MediaUploader::Attacher\",\"Post\",3764,\"media\",{\"id\":\"post/media/0e6df95029c87473a8df9e2a9400deea\",\"storage\":\"cache\"}],\"jid\":\"7c9131c6b94a9fac8755c525\",\"created_at\":1632801905.1634762,\"enqueued_at\":1632827658.9060004,\"error_message\":\"Source format is multi-layer, but destination format is single-layer. If you care only about the first layer, add .loader(page: 0)to your pipeline. If you want to process each layer, see https://github.com/janko/image_processing/wiki/Splitting-a-PDF-into-multiple-images or use.saver(allow_splitting: true).\",\"error_class\":\"ImageProcessing::Error\",\"failed_at\":1632801907.5167108,\"retry_count\":10,\"retried_at\":1632817575.1367998}"}