fix: 将无值的属性在输出RN时视为true#2486
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When compiling templates for React/RN, attributes written without a
value (e.g. <scroll-view scroll-y>) had their value parsed as
undefined, which JSON.stringify silently drops. Now such attributes
correctly emit `true` in the generated render function, matching
miniprogram boolean-attribute semantics.
Attributes with an explicit value (e.g. scroll-y="{{undefined}}") are
unchanged.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
mackwang112
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在输出RN编译模板时，未指定值的属性（例如
<scroll-view scroll-y>）其值被解析为{"scroll-y": undefined}。现在，此类属性在生成的渲染函数中正确地处理为
{"scroll-y": true}（等价于<scroll-view scroll-y="{{ true}}">），与小程序布尔属性语义对齐。具有显式值的属性（例如scroll-y="{{undefined}}"）保持不变。