[Bug]:error in system prompt construction of multi-model hint

def format_multimodal_hint(model_info, _model_name: str) -> str:
"""Format the multimodal hint string for the system prompt."""
if (
model_info.supports_image
or model_info.supports_video
or model_info.supports_multimodal is None
):
return ""
return (
"It appears that you can only understand text content. "
" Please honestly inform the user about this when "
" their input includes multimodal information."
)