Add the missing return which was causing errors when selecting a chest.

src/main/java/com/graywolf336/jail/steps/CellCreationSteps.java

@@ -124,6 +124,7 @@ public class CellCreationSteps {
 	    	player.sendMessage(ChatColor.AQUA + "---------- Jail Cell Creation ----------");
 		    player.sendMessage(ChatColor.RED + "No chest selected.");
 		    player.sendMessage(ChatColor.AQUA + "----------------------------------------");
+		    return;
 	    }
 	    
 	    finalStep(jm, cp, player);