Core/Spells: Some corrections after 65aca2b806, this should fix the console spam

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

@@ -1672,6 +1672,9 @@ bool WorldObject::canSeeOrDetect(WorldObject const* obj, bool ignoreStealth, boo
         if (Player const* player = this->ToPlayer())
             viewpoint = player->GetViewpoint();
 
+        if (!viewpoint)
+            viewpoint = this;
+
         if (!corpseCheck && !viewpoint->IsWithinDist(obj, GetSightRange(obj), false))
             return false;
     }

src/server/game/Entities/Player/Player.cpp

@@ -22973,11 +22973,8 @@ void Player::SetViewpoint(WorldObject* target, bool apply)
 WorldObject* Player::GetViewpoint() const
 {
     if (uint64 guid = GetUInt64Value(PLAYER_FARSIGHT))
-    {
-        WorldObject* viewpoint = (WorldObject*) ObjectAccessor::GetObjectByTypeMask(*this, guid, TYPEMASK_SEER);
-        return viewpoint ? viewpoint : (WorldObject*) this;  // always expected not NULL
-    }
-    return (WorldObject*) this;
+        return (WorldObject*)ObjectAccessor::GetObjectByTypeMask(*this, guid, TYPEMASK_SEER);
+    return NULL;
 }
 
 bool Player::CanUseBattlegroundObject()