Error handler for 404 - CachedNetworkImage

[SchrodingersGat]

The CachedNetworkImage library throws an error if the image returns a 404

However the image may be missing on the server! Catch and ignore a 404 error from CachedNetworkImage

Refs:

• https://stackoverflow.com/questions/62491230/how-to-handle-404-exception-with-cachednetworkimage-in-flutter
• https://stackoverflow.com/questions/65732967/flutter-cachednetworkimage-errors-cachemanager-failed-to-download-file-and
• https://stackoverflow.com/questions/58004861/getting-404-status-error-in-cachednetworkimage-crashing-app
• https://stackoverflow.com/questions/56057003/app-crashes-when-image-url-is-not-specified-in-cachednetworkimage
• https://stackoverflow.com/questions/62864682/handle-image-errors-when-image-doesnt-exist-in-flutter
• HttpException: No valid statuscode. Baseflow/flutter_cached_network_image#273
• https://pub.dev/packages/cached_network_image