fix(Net/persist): 纠正错误处理方式,拿掉 err 是 Observable 的假设 #663
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...err 是 Observable 的合理可能只存在于有地方抛错时抛的是 Observable
的情况;这不符合正常操作习惯。(已经在 #668 中由于导致测试失败提前调整)