fix: Fix the condition of the logical operators of `master_user_arn`

[MaximPeten]

Description

Specifying the master_user_arn will result in it being interpreted as null, causing property value not to be applied. An error exists in the logical operator for that property value.

Motivation and Context

Due to that change, we can properly use master_user_arn

Breaking Changes

How Has This Been Tested?

• [ ] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [ ] I have tested and validated these changes using one or more of the provided examples/* projects
• [ ] I have executed pre-commit run -a on my pull request

[github-actions[bot]]

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