Added a check to make sure the server doesn't exist before creating it

src/routes.php

@@ -73,9 +73,17 @@ $app->get('/server/{serverName}/status', function (Request $request, Response $r
   $config = $this->get('config');
   $serverDir = join('/', array($config->get('server_directory'), $args['serverName']));
 
+  // check if the server exists - if not, return a false result
+  if (!is_dir($serverDir)) {
+    $response->getBody()->write(json_encode(array('exists' => false)));
+    return $response
+      ->withHeader('Content-Type', 'application/json');
+  }
+
   // create server object and pass info back to client as JSON data
   $server = new Server($serverDir);
   $serverData = [
+    'exists'  => true,
     'name'    => $server->getName(),
     'version' => $server->getVersion(),
     'state'   => $server->getState() ? 'Running' : 'Stopped',