Fixes #4195 again: judging closing status at putLast method #4725
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之前提交的PR #4196 只在put方法加了closing状态判断,漏了putLast方法修订,无论put方法还是putLast均需判断closing状态,切换数据库地址关闭DataSource期间,不能将旧DataSource的连接加入connection数组。
See #4195