properly support puzzles with no outputs

Author: ianh

sim.c

@@ -1469,6 +1469,8 @@ static void check_completion(struct solution *solution, struct board *board)
             min = count;
     }
     board->complete = min >= solution->target_number_of_outputs;
+    if (min == UINT64_MAX)
+        return;
     if (min > board->output_cycles_capacity) {
         board->output_cycles_capacity = (min * 3) / 2;
         if (board->output_cycles_capacity < 6)

steady-state.c

@@ -257,7 +257,7 @@ struct steady_state run_until_steady_state(struct solution *solution, struct boa
             uint64_t repetition_period_length = board->cycle - snapshot.cycle;
             struct steady_state result = {
                 .number_of_cycles = board->cycle - snapshot.cycle,
-                .number_of_outputs = UINT64_MAX,
+                .number_of_outputs = solution->number_of_inputs_and_outputs ? UINT64_MAX : 0,
                 .outputs_repeat_after_cycle = board->cycle,
                 .eventual_behavior = EVENTUALLY_ENTERS_STEADY_STATE,
             };