Normalization Clickhouse: Fix exception in case password is not provided

[CrafterKolyan]

Fix #10217

How

The same way as all other connectors. Just use the safe config.get("password", "")

🚨 User Impact 🚨

No breaking changes.

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[marcosmarxm]

This will assign "" an empty string as the password. Can you check if the expected config is maybe without this key or with None instead?

[CrafterKolyan]

As I see the password field may be omitted:
https://github.com/burmecia/dbt-clickhouse/blob/cbac6c11893f8485de417b350c73095192c6ce86/dbt/include/clickhouse/sample_profiles.yml#L13-L19

[marcosmarxm]

thanks @CrafterKolyan sorry the long delay.