[ASSERT] Attempting to SetProperty on a non-existing property

## Description
Reported on Discord:

https://discord.com/channels/622075717659656195/622076898880520195/1409044934442483793

## To Reproduce
1. Follow GitHub instructions for compiling Overload
2. Run OvEditor
3. Create a new project
4. Notice the issue

## Expected behavior
Shouldn't hit this assert.