ComfyUI-converted checkpoints ship the template as chat_template.jinja
(not on the processor), so apply_chat_template raised 'this processor does
not have a chat template'. Backfill processor.chat_template from
chat_template.jinja/.json or the tokenizer at load time, and fall back to a
hand-built Qwen-VL ChatML prompt if none exists. Also keep *.jinja in the
auto-download patterns.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>