How to reproduce:
1. Open/create any project and install Input System package
2. Create -> Input Actions and open it
3. Create a new action map
4. Select the default Binding under the default Action
5. No Control Schemes > Add control scheme... and name it " " (without the commas)
6. Select the new empty checkbox under Use in control scheme
7. Add another control scheme and name it "  " (two spaces)

Expected result: It is impossible to create an empty named control scheme
Actual result: Biding disappears

Reproducible with: 1.4.4 (2021.3.16f1), 1.6.1 (2023.2.0a21)