The cs-fix pass (758a9cab) typed ImageUtils::validateURL()'s URL and
StreamSorter::formatTitle()'s title as non-nullable strings, but both
come from nullable columns (streams.stream_icon / stream_display_name,
streams_series.title / cover, …). get_live_streams passed a channel's
NULL stream_icon straight in, so one channel without an icon turned the
line's entire live list into a TypeError page — and the same for any of
the ~100 validateURL() callers (series covers, backdrops, episode
images, admin and reseller views) and a title-less stream or series.
Both now take null as '' (unit-tested). player_api also no longer hands
filterLoaded() a null when the categories cache file is missing.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y4P9p5BXijMoGXd31tN6Zp
