Ab2d-6007/update reguest file

[smirnovaae]

🎫 Ticket

https://jira.cms.gov/browse/AB2D-6007

🛠 Changes

If effective date is null, then we write only mbi to request file

ℹ️ Context for reviewers

(Background context, more in-depth details of the implementation, and anything else you'd like to call out or ask reviewers.)

✅ Acceptance Validation

🔒 Security Implications

• This PR adds a new software dependency or dependencies.
• This PR modifies or invalidates one or more of our security controls.
• This PR stores or transmits data that was not stored or transmitted before.
• This PR requires additional review of its security implications for other reasons.

If any security implications apply, add Jason Ashbaugh (GitHub username: StewGoin) as a reviewer and do not merge this PR without his approval.