Fix a bug with loading no longer recognised school IDs
Fix a bug with loading no longer recognised school IDs

# We may want to actually revert to the previous ID before saving, to avoid losing info if they don't update their school again.

ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app