* Fix possible server crash in Player::IsAtGroupRewardDistance, by Spp

* Fix possible server crash in Player::RewardPlayerAndGroupAtEvent
* Wintergrasp: Correct use of RewardPlayerAndGroupAtEvent, by Spp

--HG--
branch : trunk

src/game/Player.cpp

@@ -20289,6 +20289,8 @@ bool Player::RewardPlayerAndGroupAtKill(Unit* pVictim)
 
 void Player::RewardPlayerAndGroupAtEvent(uint32 creature_id, WorldObject* pRewardSource)
 {
+    if (!pRewardSource)
+        return;
     uint64 creature_guid = (pRewardSource && pRewardSource->GetTypeId()==TYPEID_UNIT) ? pRewardSource->GetGUID() : uint64(0);
 
     // prepare data for near group iteration
@@ -20314,6 +20316,8 @@ void Player::RewardPlayerAndGroupAtEvent(uint32 creature_id, WorldObject* pRewar
 
 bool Player::IsAtGroupRewardDistance(WorldObject const* pRewardSource) const
 {
+    if (!pRewardSource)
+        return;
     const WorldObject* player = GetCorpse();
     if(!player || isAlive())
         player = this;

src/game/Wintergrasp.cpp

@@ -865,18 +865,18 @@ void OPvPWintergrasp::HandleKill(Player *killer, Unit *victim)
     {
         if (victim->getLevel() >= 70)
             ok = true;
-        killer->RewardPlayerAndGroupAtEvent(CRE_PVP_KILL, 0);
+        killer->RewardPlayerAndGroupAtEvent(CRE_PVP_KILL, victim);
     }
     else
     {
         switch(GetCreatureType(victim->GetEntry()))
         {
             case CREATURE_SIEGE_VEHICLE:
-                killer->RewardPlayerAndGroupAtEvent(CRE_PVP_KILL_V,0);
+                killer->RewardPlayerAndGroupAtEvent(CRE_PVP_KILL_V, victim);
                 ok = true;
                 break;
             case CREATURE_GUARD:
-                killer->RewardPlayerAndGroupAtEvent(CRE_PVP_KILL, 0);
+                killer->RewardPlayerAndGroupAtEvent(CRE_PVP_KILL, victim);
                 ok = true;
                 break;
             case CREATURE_TURRET: