Attempting to load a wallet with an unknown descriptor causes a fatal error:

```
2022-09-06T01:51:06Z init message: Loading wallet…
2022-09-06T01:51:06Z [descriptor] Invalid descriptor: Can only have tr at top level: iostream error
2022-09-06T01:51:06Z [descriptor] Invalid descriptor: Can only have tr at top level: iostream error
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 50e6032b4d1d62c020ebb6a4d0c8fafc6f01ea80f4d2a41c1a256086611636e9, type = legacy, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 7f709abbde61e8c253798375692bf41202e625ed74a65f9474d464be34fb2870, type = p2sh-segwit, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 2dc6c34099e0ca1235fc990a51042967ecbc8c8ac57062f964739cba2f451be8, type = bech32, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 8d3c63ea1ac9936e789713dc8bae857d328ff029ab9392e67c716752e9b11b0c, type = bech32m, internal = false
2022-09-06T01:51:06Z [descriptor] Releasing wallet
2022-09-06T01:51:06Z 

************************
EXCEPTION: St12out_of_range       
map::at       
bitcoin in Runaway exception       



************************
EXCEPTION: St12out_of_range       
map::at       
bitcoin in Runaway exception       

bitcoin-qt: ./checkqueue.h:204: CCheckQueue<CScriptCheck>::~CCheckQueue() [T = CScriptCheck]: Assertion `m_worker_threads.empty()' failed.
Aborted
```

> A fatal error occurred. Bitcoin Core can no longer continue safely and will quit.

To reproduce, a quick hack:

```c++
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -1408,7 +1408,7 @@ std::unique_ptr<DescriptorImpl> ParseScript(uint32_t& key_exp_index, Span<const
         error = "Can only have addr() at top level";
         return nullptr;
     }
-    if (ctx == ParseScriptContext::TOP && Func("tr", expr)) {
+    if (ctx == ParseScriptContext::TOP && Func("trx", expr)) {
         auto arg = Expr(expr);
         auto internal_key = ParsePubkey(key_exp_index, arg, ParseScriptContext::P2TR, out, error);
         if (!internal_key) {
```
{
    // Do some checking on  path. It should be either a
    //
    //  Path where a directory can be created.
    // 2. Path to an existing directory.
    // 3. Path to a symlink to a directory.
    // 4. For backwards compatibility, the name of a data file in -dir.
    const fspath _path = fsbridgeAbsPathJoin(GetWalletDir(), fsPathFromString(name));
    fsfile_type path_type = fssymlink_status(_path).type();
    if (!(path_type == fsfile_typenot_found || path_type == fsfile_typedirectory ||
          (path_type == fsfile_typesymlink && fsis_directory(_path)) ||
          (path_type == fsfile_typeregular && fsPathFromString(name).filename() == fsPathFromString(name)))) {
        error_string = Untranslated(strprintf(
              "Invalid - path '%s'. - path should point to a directory wher.dat and "
              "database/log.?????????? files can be stored, a location where such a directory could be created, "
              "or (for backwards compatibility) the name of an existing data file in -dir (%s)",
              name, fsquoted(fsPathToString(GetWalletDir()))));
        status = DatabaseStatusFAILED_BAD_PATH;
        return nullptr;
    }
    return MakeDatabase(_path, options, status, error_string);
}
stdshared_ptr<CWallet> CWalletCreate(WalletContext& context, const stdstring& name, stdunique_ptr<WalletDatabase> database, uint64_t _creation_flags, bilingual_str& error, stdvector<bilingual_str>& warnings)
{
    interfacesChain* chain = context.chain;
    ArgsManager& args = *Assert(context.args);
    const stdstring& File = database->Filename();
    int64_t nStart = GetTimeMillis();
    // TODO Can't use stdmake_shared because we need a custom deleter but
    // should be possible to use stdallocate_shared.