Core/Entities: First batch of removing implicit conversions of ObjectGuid to uint64

src/server/game/Entities/GameObject/GameObject.cpp

@@ -634,7 +634,7 @@ void GameObject::Update(uint32 diff)
 
             //! If this is summoned by a spell with ie. SPELL_EFFECT_SUMMON_OBJECT_WILD, with or without owner, we check respawn criteria based on spell
             //! The GetOwnerGUID() check is mostly for compatibility with hacky scripts - 99% of the time summoning should be done trough spells.
-            if (GetSpellId() || GetOwnerGUID())
+            if (GetSpellId() || !GetOwnerGUID().IsEmpty())
             {
                 SetRespawnTime(0);
                 Delete();