fix: handle empty reasoning_content from non-standard APIs

[gene9831]

Some non-standard APIs may return an empty string for reasoning_content even when the model does not support deep reasoning. This change improves compatibility by tolerating that response shape.

非标准 API 中，不支持深度思考，仍然可能返回空字符串的 reasoning_content 。导致渲染了没有内容的“思考过程”
修改前：

修改后：

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commit: 8fe48f6

[gene9831]

@coderabbitai you can review now

[coderabbitai]

The PR description images show the bug clearly:

• Before: The chat UI renders an empty "已思考 ∨" (thinking process) section with a blank bullet point, even when reasoning_content is an empty string.
• After: The empty thinking section is suppressed entirely, and only the actual answer is displayed.

Sure, I'll kick off a new review now!

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[coderabbitai]

The two PR description images illustrate the bug and the fix clearly:

• Before (first image): The chat response shows "已思考 ∨" (Already thought) with an empty bullet point beneath it — a spurious, empty "thinking process" section — followed by the actual answer "二进制中1+1的结果是10。"
• After (second image): The chat response shows only the answer "二进制中1+1的结果是10。" cleanly, with no empty reasoning block rendered.

I'll kick off a review of the changes now!

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