The following has evaluated to null or missing:
==> list.rows[0]  [in template "标题列表.ftl" at line 59, column 71]

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Tip: It's the final [] step that caused this error, not those before it.
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Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: @article_detail articleId="${list.row...  [in template "标题列表.ftl" at line 59, column 41]
	- Reached through: @article_list categoryId="${categoryI...  [in template "标题列表.ftl" at line 52, column 17]
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