AC-2242::fixed failing mftf test case and implemented PR comment

Author: glo82145

app/code/Magento/SalesRule/Controller/Adminhtml/Promo/Quote/Save.php

@@ -64,8 +64,9 @@ public function execute()
     {
         $data = $this->getRequest()->getPostValue();
         if ($data) {
-            $data['simple_free_shipping'] = isset($data['simple_free_shipping']) ? $data['simple_free_shipping'] : null
-
+            if ($data['simple_free_shipping'] === '') {
+                $data['simple_free_shipping'] = null;
+            }
             try {
                 /** @var $model \Magento\SalesRule\Model\Rule */
                 $model = $this->_objectManager->create(\Magento\SalesRule\Model\Rule::class);

app/code/Magento/SalesRule/Test/Mftf/Test/SimplefreeshippingoptionsTest.xml

@@ -37,10 +37,7 @@
         <fillField selector="{{AdminCartPriceRulesFormSection.ruleName}}" userInput="{{CartPriceRuleConditionAndFreeShippingApplied.name}}" stepKey="fillRuleName"/>
         <fillField selector="{{AdminCartPriceRulesFormSection.description}}" userInput="{{CartPriceRuleConditionAndFreeShippingApplied.description}}" stepKey="fillDescription"/>
         <selectOption selector="{{AdminCartPriceRulesFormSection.websites}}" userInput="{{CartPriceRuleConditionAndFreeShippingApplied.websites}}" stepKey="selectWebsites"/>
-        <click selector="{{AdminCartPriceRulesFormSection.customerGroups}}" stepKey="expandCustomerGroups"/>
-        <fillField selector="{{AdminCartPriceRulesFormSection.customerGroupsInput}}" userInput="General" stepKey="fillCustomerGroup"/>
-        <click selector="{{AdminCartPriceRulesFormSection.customerGroupsFirstResult}}" stepKey="selectGroup"/>
-        <click selector="{{AdminCartPriceRulesFormSection.customerGroupsDoneBtn}}" stepKey="closeMultiSelect"/>
+        <selectOption userInput="{{SimpleCatalogPriceRule.customerGroups}}" selector="{{AdminCartPriceRulesFormSection.customerGroups}}" stepKey="selectCustomerGroups"/>       
         <selectOption selector="{{AdminCartPriceRulesFormSection.coupon}}" userInput="{{CartPriceRuleConditionAndFreeShippingApplied.coupon_type}}" stepKey="selectCouponType"/>
         <scrollTo selector="{{AdminCartPriceRulesFormSection.actionsHeader}}" stepKey="scrollToActionsHeader"/>
         <actionGroup ref="AdminCreateCartPriceRuleActionsSectionDiscountFieldsActionGroup" stepKey="createActiveCartPriceRuleActionsSection">