Dynamically determine database validity

* Check that the database composite key exists, has sub-keys associated with it, and the root group exists.

src/cli/Import.cpp

@@ -84,7 +84,6 @@ int Import::execute(const QStringList& arguments)
     Database db;
     db.setKdf(KeePass2::uuidToKdf(KeePass2::KDF_ARGON2));
     db.setKey(key);
-    db.setInitialized(true);
 
     if (!db.import(xmlExportPath, &errorMessage)) {
         errorTextStream << QObject::tr("Unable to import XML database: %1").arg(errorMessage) << endl;