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b75e314f - [Bugfix] Add image placeholder for OpenAI Compatible Server of MiniCPM-V (#6787)

[Bugfix] Add image placeholder for OpenAI Compatible Server of MiniCPM-V (#6787) Co-authored-by: hezhihui <hzh7269@modelbest.cn> Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>