fix: return N/A if rent and income is NaN

[KrissDrawing]

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Issue Overview

This PR addresses #3035

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Description

While not passing rent and income values, we've sent probably null value that was processed anyway as valid number, so while formatting parseFloat returned NaN.
Now instead of $NaN per month it displays as N/A per month etc.
Not sure if that should also contain $ before N/A

How Can This Be Tested/Reviewed?

We need to have listing where in listing units we select nothing in How is Rent Determined?. While editing listing just remove existing values, at first it can throw error while saving, but after open listing unit and saving it again it should work fine.

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[emilyjablonski]

If we return this string in English here, the translations won't come through. We may need to pass just the key ("t.n/a") (like we are doing here: https://github.com/bloom-housing/bloom/blob/dev/ui-components/src/tables/StandardTable.tsx#L155) and translate on the frontend (which we allow here: https://github.com/bloom-housing/bloom/blob/dev/ui-components/src/tables/StandardTable.tsx#L155)

[emilyjablonski]

Just need to be able to support translations! Context above

[emilyjablonski]

translations are coming through now, thank you! the last update will be that we don't want the `per month` string in these `n/a` cases

[emilyjablonski]

🥳