try to deal with consecutive null moves

dda_queue.c

@@ -88,6 +88,7 @@ void enqueue(TARGET *t) {
 // sometimes called from normal program execution, sometimes from interrupt context
 void next_move() {
 	if (queue_empty() == 0) {
+		do {
 			// next item
 			uint8_t t = mb_tail + 1;
 			t &= (MOVEBUFFER_SIZE - 1);
@@ -102,6 +103,7 @@ void next_move() {
 				dda_start(&movebuffer[t]);
 			}
 			mb_tail = t;
+		} while ((queue_empty() == 0) && (movebuffer[mb_tail].live == 0));
 	}
 	else
 		setTimer(0);