I have 2 legacy wallets and on both if I run `upgradewallet` it will cause bitcoin core to crash. This should just return me an error string

Currenl result from `getwalletinfo`:
```
{
  "walletname": "Wallet",
  "walletversion": 169900,
  "format": "bdb",
  "balance": 0.00000000,
  "unconfirmed_balance": 0.00000000,
  "immature_balance": 0.00000000,
  "txcount": 80,
  "keypoololdest": 1613078825,
  "keypoolsize": 941,
  "keypoolsize_hd_internal": 941,
  "paytxfee": 0.00000000,
  "private_keys_enabled": false,
  "avoid_reuse": true,
  "scanning": false,
  "descriptors": false
}
```
if (!m_wallet_descriptor.descriptor->Expand(i, provider, scripts_temp, out_keys, &temp_cache)) return false;
        }
        
        for (const CScript& script : scripts_temp) {
            m_map_script_pub_keys[script] = i;
        }
        for (const auto& pk_pair : out_keys.pubkeys) {
            const CPubKey& pubkey = pk_pair.second;
            if (m_map_pubkeys.count(pubkey) != 0) {
                
                
                continue;
            }
            m_map_pubkeys[pubkey] = i;
        }
        
        DescriptorCache new_items = m_wallet_descriptor.cache.MergeAndDiff(temp_cache);
        if (!batch.WriteDescriptorCacheItems(id, new_items)) {
            throw std::runtime_error(std::string(__func__) + ": writing cache items failed");
        }
        m_max_cached_index++;
    }
    m_wallet_descriptor.range_end = new_range_end;
    batch.WriteDescriptor(GetID(), m_wallet_descriptor);
    
    assert(m_wallet_descriptor.range_end - 1 == m_max_cached_index);
    NotifyCanGetAddressesChanged();
    return true;
}
std::vector<WalletDestination> DescriptorScriptPubKeyMan::MarkUnusedAddresses(const CScript& script)