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[Fix] Add checks to ensure PLCrashReportExceptionInfo has non-nil name and reason

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## Description We encountered a system exception crash [here](https://github.com/microsoft/appcenter-sdk-apple/blob/4bc5282dfc6c273a993e67d8f8c61d8014d257e0/AppCenterCrashes/AppCenterCrashes/Internals/Util/MSACErrorLogFormatter.m#L636) on Outlook iOS when copying `PLCrashReport.exceptionInfo.exceptionReason` but it was nil. By going through the code, this can only happen when `[NSString...

[Fix] Fixes the system exception when initializing NSString from `exceptionReason` with nil value

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## Description We encountered a system exception on Outlook iOS when `[NSString stringWithString:report.exceptionInfo.exceptionReason];` tried to create a string from a nil value. This PR prevents this by checking that `exceptionReason`...

请教一个使用 v2ex api 的问题

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您好！ 在使用 v2 的 api 想请求某一个标签--比如 Apple 酷工作 等--的话题列表时没有找到对应的 api，仅找到类似 /topics/show.json?node_name=XXX 的方法筛选对应节点的帖子，但问题一是请求的帖子顺序与官网的不符，问题二是找不到类似 R2 这样的节点，请问您在客户端中是如何实现的呢？