Fixes crash when no inputs are loaded (#185)

- However, things don't seem to be properly reset

src/main/java/com/minecrafttas/tasmod/playback/PlaybackControllerClient.java

@@ -447,7 +447,7 @@ private void playbackNextTick() {
 		}
 
 		/* Stop condition */
-		if (index == inputs.size()) {
+		if (index == inputs.size() || inputs.isEmpty()) {
 			unpressContainer();
 			setTASState(TASstate.NONE);
 		}