Warning when switching from Networks tab with unsaved changes

[Nick Bogdanov]

Warning "Warning: setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component. This is a no-op. Please check the code for the NetworkTab component." appears in console when applying unsaved changes from the dialog.

Steps to reproduce:
1. Log in
2. Create cluster
3. Go to "Networks" tab and make some valid changes
4. Go to e.g. "Dashboard" tab
5. Unsaved changes dialog appears
6. Click "Save and Proceed" button
7. After changes are saved and dialog is closed above warning appears in the console.

Expected results:
No warnings displayed

Actual result:
Warning: setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component. This is a no-op. Please check the code for the NetworkTab component.

Reproducibility:
Always

Description of environment:
Fake UI (master 10.0)