Prevent error when player in papi is null

src/main/java/us/ajg0702/queue/spigot/Placeholders.java

@@ -123,6 +123,9 @@ public class Placeholders extends PlaceholderExpansion {
     	//Bukkit.getLogger().info("itentifier: "+identifier);
 
 
+        if(player == null) return "No player";
+        
+        
     	String noc = "_nocache";
     	if(identifier.length() > noc.length()) {
     		int olen = identifier.length()-noc.length();