*Fix a crash in Object.h

*Fix action button saving
*Fix a crash on item swap in guild bank
*Fix exploit moving after death in Unit.cpp
*Fix assert fail at grid load in Creature.cpp
Thanks Sisif for these! :)

--HG--
branch : trunk

src/game/Object.h

@@ -518,7 +518,10 @@ class TRINITY_DLL_SPEC WorldObject : public Object, public WorldLocation
 
         bool IsInMap(const WorldObject* obj) const
         {
-            return IsInWorld() && obj->IsInWorld() && (GetMap() == obj->GetMap()) && InSamePhase(obj);
+            if (obj)
+                return IsInWorld() && obj->IsInWorld() && (GetMap() == obj->GetMap()) && InSamePhase(obj);
+            else
+                return false;
         }
         bool IsWithinDist3d(float x, float y, float z, float dist) const
             { return IsInDist(x, y, z, dist + GetObjectSize()); }