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
}
```
{
    return !m_hd_chain.seed_id.IsNull();
}
bool LegacyScriptPubKeyMan::CanGetAddresses(bool internal) const
{
    LOCK(cs_KeyStore);
    
    bool keypool_has_keys;
    if (internal && m_storage.CanSupportFeature(FEATURE_HD_SPLIT)) {
        keypool_has_keys = setInternalKeyPool.size() > 0;
    } else {
        keypool_has_keys = KeypoolCountExternalKeys() > 0;
    }
    
    if (!keypool_has_keys) {
        return CanGenerateKeys();
    }
    return keypool_has_keys;
}
bool LegacyScriptPubKeyMan::Upgrade(int prev_version, int new_version, bilingual_str& error)
{
    LOCK(cs_KeyStore);
    bool hd_upgrade = false;
    bool split_upgrade = false;
    if (IsFeatureSupported(new_version, FEATURE_HD) && !IsHDEnabled()) {
        WalletLogPrintf("Upgrading wallet to HD\n");
        m_storage.SetMinVersion(FEATURE_HD);
        
        CPubKey masterPubKey = GenerateNewSeed();