Fix install (#8724)

Don't try to connect to the database if it isn't configured yet.

app/Providers/AppServiceProvider.php

@@ -20,9 +20,10 @@ class AppServiceProvider extends ServiceProvider
      */
     public function boot()
     {
-        // connect legacy db
+        // connect legacy db, only if configured
         //FIXME this is for auth right now, remove later
         $db_config = config('database.connections')[config('database.default')];
+        if (!empty($db_config['database'])) {
             dbConnect(
                 $db_config['host'],
                 $db_config['username'],
@@ -31,6 +32,7 @@ class AppServiceProvider extends ServiceProvider
                 $db_config['port'],
                 $db_config['unix_socket']
             );
+        }
 
         // load config
         Config::load();