How to reproduce:
1. Create a new project in your preferred workspace and open it
2. Connect it to Perforce
3. Click "Work Offline"
4. In the Project Window create a new material
5. Observe the console

Expected result: no errors/warnings are thrown
Actual result: "Version Control: Cannot set mode of files in offline mode" error is thrown when creating assets in offline mode

Reproducible in: 2020.1.0a3, 2019.3.0b2, 2019.3.0a1 (Throws the error when creating files in offline mode)
Partially reproducible in: 2019.2.3f1, 2019.2.0a1 (Throws the error when switching VCS Modes, does not do so when creating files in offline mode)
Not reproducible in: 2019.1.14f1, 2018.4.8f1, 2017.4.32f1