clickhousereader 提示密码不能为空的问题，这个校验可以非强制吗？

clickhousereader读取数据源数据时，总是提示密码不能为空，但是数据源的密码就是空的，datax做了这个强制校验，有什么办法可以在datax层面做调整吗？clickhouse是客户的数据源，不方便新增用户或者加密码

Start at the clickhousereader data-source read path and locate where the empty-password validation is triggered. Reproduce the issue with a ClickHouse source that has no password, then inspect existing reader tests or validation coverage. Done means the intended empty-password behavior is documented and verified by a passing test.

Written by the indexing model from the issue text.