The IsolatedMarginTrading contract does not define a default liquidationThresholdPercent which means it is set to 0. The belowMaintenanceThreshold function uses this value and anyone could be liquidated due to 100 * holdings >= liquidationThresholdPercent * loan = 0 being always true.
Anyone can be liquidated immediately. If the faulty belowMaintenanceThreshold function is fixed (see other issue), then nobody could be liquidated which is bad as well.
Recommend setting a default liquidation threshold like in CrossMarginTrading contracts.
