StreamService::process() runs the stream icon through
ImageUtils::downloadImage() when "download images" is on, and an empty icon
arrives there as null. The `string` type the cs-fix pass (758a9cab) put on
the parameter made that a TypeError, so saving a new stream with no icon
answered an empty page and created nothing. Series, movies, episodes, radios
and created channels hand it optional covers and backdrops the same way.
downloadImage() now takes null and hands back whatever it cannot download
unchanged, null included. Found by the new E2E stream test.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016WDhDajBPziJwjWZcXnh6R