Issue #3338246 by Matroskeen: Export actions (inherited from VboExportBase) do...

      // Ensure compatibility with a Batch API process.

      $context = [

        'sandbox' => [],

        'results' => [],

        'sandbox' => [

          'processed' => 0,

          'total' => 0,

          'page' => 0,

          'current_batch' => 1,

        ],

        'results' => [

          'operations' => [],

        ],

      ];

      $this->setActionContext($context);