fix nullpointer

src/de/steamwar/bungeecore/commands/WhoisCommand.java

@@ -112,7 +112,7 @@ public class WhoisCommand extends SWCommand {
         if (parameterTypes.contains(WhoisParameterTypes.MOD)) {
             List<Mod> activeMods = Utils.playerModMap.get(user.getUuid());
 
-            if (!activeMods.isEmpty()) {
+            if (activeMods != null && !activeMods.isEmpty()) {
                 Message.send("WHOIS_ACTIVE_MODS", player,activeMods.size());
                 String result = activeMods.stream().map(mod -> "§" + mod.getModType().getColorCode() + mod.getModName()).collect(Collectors.joining("§8, "));
                 Message.send("WHOIS_ACTIVE_MOD", player, result);