Bastien Nocera authored Jul 30, 2018 and Germán Poo-Caamaño committed Aug 10, 2018

No need to try loading the file through the decompressing loader if the
contents inside the document is known to be unsupported. This changes
the error message for loading WebP comics from:
Error loading document: File type Zip archive (application/zip) is not supported
to:
Error loading document: No supported images in archive