Hotfix NPE

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_Main/src/de/steamwar/fightsystem/fight/FightTeam.java

@@ -186,7 +186,7 @@ public class FightTeam implements IFightTeam{
 
     public void setLeader(FightPlayer leader) {
         this.leader = leader;
-        if(ready)
+        if(ready && leader != null)
             setReady(false);
 
         if (leader == null){