Core/Object: Add an assert in Object::RemoveFlag to help explain the crash introduced in r2969543fa565b71242cb471e0e85f39203f2bce9

The crash is NOT fixed yet.

--HG--
branch : trunk

src/server/game/Entities/Object/Object.cpp

@@ -1059,6 +1059,8 @@ void Object::SetFlag(uint16 index, uint32 newFlag)
 void Object::RemoveFlag(uint16 index, uint32 oldFlag)
 {
     ASSERT(index < m_valuesCount || PrintIndexError(index, true));
+    ASSERT(m_uint32Values);
+
     uint32 oldval = m_uint32Values[ index ];
     uint32 newval = oldval & ~oldFlag;