Crash Caused by Stateless FSM

[RexPaster]

Simulator crashes when a StateMachine has no initial state

Description

If a circuit contains a StateMachine element with no defined initial
state, starting the simulator results in a NullPointerException.

This occurs because currentState is null when
StateMachine.initSim() attempts to call
currentState.sendOutputs(...).

Instead of reporting a user-facing error, the simulator crashes and
generates a bug report dialog.

Steps to Reproduce

1. Create a new circuit.
2. Add a StateMachine element.
3. Do not add any states (or remove all states).
4. Start the interactive simulator.

Expected Behavior

The simulator should display a clear error message indicating that the
state machine has no initial state and prevent the simulation from
starting.

Actual Behavior

The simulator crashes with a NullPointerException.