str object has no attribute 'tzinfo'

[iamtalhaasghar]

Describe the bug
If an empty string is sent as a value for a Nullable(DateTime) column it was not being treated as Null value.

To Reproduce
create a Nullable(Datetime) column and try to insert empty string.

Expected behavior
if a an empty string is sent as a value for Nullable(DateTime) column it should be treated as Null value so as to avoid other complications .i.e. timezone conversion etc.

Versions

• Version of package with the problem: 0.2.9
• ClickHouse server version: 25.3.4.190
• Python version: 3.11