Include connection errors in exception handling

ref-test/app/tools/auth.py

@@ -15,7 +15,7 @@ def require_account_creation(function):
             if User.query.count() == 0:
                 flash('Please register a user account.', 'alert')
                 return redirect(url_for('admin._register'))
-        except SQLAlchemyError as exception:
+        except (SQLAlchemyError, ConnectionError) as exception:
             write('system.log', f'Database error when checking for existing accounts: {exception}')
             return abort(500)
         return function(*args, **kwargs)