fix: null checks in minMax process

[ColinBuyck]

This PR addresses #4631

• Addresses the issue in full
• Addresses only certain aspects of the issue

Description

The units summarization process was failing to handle multiple units without rent information. The first unit was correctly handled with "t.n/a" in the getDefaultSummary function but then from there the inputs to a minMax function were t.n/a and null leading to the NaN. This fix avoids the minMax comparison if the unit's associated field is null.

How Can This Be Tested/Reviewed?

Add multiple units of the same unit type to a listing that have no rent or rent as a percentage of income information. Ensure that the unit summary displays with n/a rather than NaN per month.

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

[netlify]

✅ Deploy Preview for bloom-public-seeds ready!

Name	Link
🔨 Latest commit	372d6c7
🔍 Latest deploy log	https://app.netlify.com/sites/bloom-public-seeds/deploys/67a391de5256cc0008e70064
😎 Deploy Preview	https://deploy-preview-4632--bloom-public-seeds.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for partners-bloom-dev ready!

Name	Link
🔨 Latest commit	372d6c7
🔍 Latest deploy log	https://app.netlify.com/sites/partners-bloom-dev/deploys/67a391def0c98f000884fde1
😎 Deploy Preview	https://deploy-preview-4632--partners-bloom-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for bloom-exygy-dev ready!

Name	Link
🔨 Latest commit	372d6c7
🔍 Latest deploy log	https://app.netlify.com/sites/bloom-exygy-dev/deploys/67a391dee3848000084a6797
😎 Deploy Preview	https://deploy-preview-4632--bloom-exygy-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[emilyjablonski]

🦩