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处理了`CollStreamUtil.toIdentityMap`和`CollStreamUtil.toMap`中，如果`value`为空时，发生`NPE`异常问题
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阿超:v5-dev
chinabugotech:v5-dev
阿超
create on 2021-12-06 21:39
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#### 说明 1. 请确认你提交的PR是到'v5-dev'分支，否则我会手动修改代码并关闭PR。 2. 请确认没有更改代码风格（如tab缩进） 3. 新特性添加请确认注释完备，如有必要，请在src/test/java下添加Junit测试用例 ### 修改描述(包括说明bug修复或者添加新特性) 1. [bug修复] 处理了`CollStreamUtil.toIdentityMap`中，如果`value`为空时，发生`NPE`异常问题 处理了`CollStreamUtil.toMap`中，如果`value`为空时，发生`NPE`异常问题 例如集合中只有部分元素为`null`或者`toMap`时`value`为`null`时 实际发生场景如下：我查询出用户与好友关联关系，并想获取Map<好友编号, 好友备注>时，使用该函数导致`NPE`，因为默认使用的 `Map.merge`不允许空值，而我此处场景下，允许未给好友备注，也就是允许`null`值，故 修复了该问题 测试用例已提供 2. [新特性] balabala……
How to merge Pull Request
git checkout v5-dev
git pull https://gitee.com/VampireAchao/hutool.git v5-dev
git push origin v5-dev
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