fix Qwen/QwQ-32B

[ochafik]

Problems in that template came from the detection of whether content needs to be non-null, which needs to add more messages when the logic only triggers in some loop iterations.

  {%- for message in messages %}
    {%- if (message.role == "user") or (message.role == "system" and not loop.first) %}
        {{- '<|im_start|>' + message.role + '\n' + message.content + '<|im_end|>' + '\n' }}
    {%- elif message.role == "assistant" and not message.tool_calls %}
        {%- set content = message.content %}
        {%- if not loop.last %}
            {%- set content = message.content.split('</think>')[-1].lstrip('\n') %}
        {%- endif %}
        {{- '<|im_start|>' + message.role + '\n' + content + '<|im_end|>' + '\n' }}
    {%- elif message.role == "assistant" %}
        {%- set content = message.content %}
        {%- if not loop.last %}
            {%- set content = message.content.split('</think>')[-1].lstrip('\n') %}
        {%- endif %}
        {{- '<|im_start|>' + message.role }}