Loan/Gift preparations without count display as NaN on preparation selecting dialog

[bronwyncombs]

Describe the bug
If a preparation doesn't have a count entered, it will show as NaN in the Preparations dialog for loans and gifts. It is also falsely linked.

To Reproduce
Steps to reproduce the behavior:

1. Create a CO, add preparation but leave count blank
2. Create New Loan or Gift and enter Cat # for the CO record you made
3. See error in Preparations selection dialog

Expected behavior
It should probably default to 1 in the available column and 0 for unavailable. Currently, you can add a preparation to the loan or gift without a count. Count isn't a required field, so this makes sense, but I'm not sure if we want that.
Screenshots

Screen.Recording.2023-08-01.at.9.27.55.AM.mov

Desktop:

• macOS, Chrome, v7.9-dev

Database Name: archireef

[grantfitzsimmons]

@bronwyncombs Can you see if this behavior happens on v7.8.13 as well? We can prioritize accordingly based on what you find 😄

[bronwyncombs]

@grantfitzsimmons, it is

Screen.Recording.2023-08-14.at.10.38.51.AM.mov

[CarolineDenis]

I'm wondering if I didn't fix that on the xml branch

[grantfitzsimmons]

https://sbnature9523-v7813.test.specifysystems.org/specify/overlay/interactions/
https://sbnature9523-v79-dev.test.specifysystems.org/specify/overlay/interactions/

These preparations have no count (no value in the DB), so when creating a loan based on these records the count shown is "NaN". This should be changed to something intuitive to the user. NaN doesn't mean anything to non-programmers