Notice: Undefined index: payment_details in commerce_payment_pane_checkout_form_submit()

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Solution of the commerce cheque module is also reusable for this module.
#1230666: Creating transactions throws undefined index for payment details

commerce_bank_transfer.module @commerce_bank_transfer_submit_form()

$form['dummy'] = array(
  '#type' => 'hidden',
  '#value' => 'dummy'
  );