Merge forwardport of #12296 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/12296.patch (created by @madonzy) based on commit(s):
  1. addda42

Fixed GitHub Issues in 2.3-develop branch:
  - #3596: Notice: Undefined index: value in /app/code/Magento/Backend/Block/Widget/Grid/Column/Filter/Select.php on line 72 (reported by @gnusmus)

app/code/Magento/Payment/Helper/Data.php

@@ -293,6 +293,7 @@ public function getPaymentMethodList($sorted = true, $asLabelValue = false, $wit
             foreach ($methods as $code => $title) {
                 if (isset($groups[$code])) {
                     $labelValues[$code]['label'] = $title;
+                    $labelValues[$code]['value'] = null;
                 } elseif (isset($groupRelations[$code])) {
                     unset($labelValues[$code]);
                     $labelValues[$groupRelations[$code]]['value'][$code] = ['value' => $code, 'label' => $title];