Check if the container owner really exists

[mtwango]

When checked container doesn't have an owner, it produces the following critical:

16:46:CRITICAL:Assert severity=2: 'pChar' file 'C:\GIT\Source-X\src\game\CResourceCalc.cpp', line 23, in ExcType=CAssert catched in SUB: CNetworkInput::ProcessMessage() ("Message")
16:46:DEBUG:Printing STACK TRACE for debugging purposes (thread id 1568).
16:46:DEBUG:_ thread name _ |   # | _____________ function _____________ |
16:46:DEBUG:         T_Main |   0 |     CNetworkManager::processAllInput | 
16:46:DEBUG:         T_Main |   1 |          CNetworkInput::processInput | 
16:46:DEBUG:         T_Main |   2 |           CNetworkInput::processData | 
16:46:DEBUG:         T_Main |   3 |           CNetworkInput::processData | 
16:46:DEBUG:         T_Main |   4 | CNetworkInput::processGameClientData | <-- exception catch point
16:46:DEBUG:         T_Main |   5 |         PacketItemDropReq::onReceive | 
16:46:DEBUG:         T_Main |   6 |             CClient::Event_Item_Drop | 
16:46:DEBUG:         T_Main |   7 |     CItemContainer::CanContainerHold | 
16:46:DEBUG:         T_Main |   8 |   CServerConfig::Calc_MaxCarryWeight | <-- last tracked function call (stack unwinding detected here)
16:46:DEBUG:1:Parsing Packet len=15 id=0x08 [2026/09/11 16:46:05]
        0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F
       -- -- -- -- -- -- -- --  -- -- -- -- -- -- -- --
0000   08 40 10 79 39 ff ff ff  ff 00 00 40 3f be aa      .@.y9......@?..

This PR checks for owner and it there is none, it doesn't calculate the option to carry more weight.

[mtwango]

I wasn't able to reproduce, how to make it bugout, but some chests, that we have on ground produces this issue while others doesn't. Even when they have more, more2, link and baseid same, one produces critical and the other one doesn't.

However this check shouldn't cause any issues, since if the owner is found, it calculates like normally and when not, the calculation is skipped.

[GladieUO]

Yup had this issue too long time ago.

Fixed it like this, I guess its very similar fix.
    if ((GetContainedLayer() == LAYER_PACK) && !(g_Cfg.m_iBackpackOverload <= -1))
    {
        CObjBase *pOwner = GetContainer();
        if (!pOwner || !pOwner->IsChar())
            return false;

        CChar *pCharContainerOwner = static_cast<CChar *>(pOwner);

        iMaxWeight += (g_Cfg.Calc_MaxCarryWeight(pCharContainerOwner) + g_Cfg.m_iBackpackOverload);
    }