MAGETWO-91542: Product belongs to categories with and without event does not shown

- Added automated test script

Author: vital-pantsialeyeu

app/code/Magento/Catalog/Test/Mftf/ActionGroup/StorefrontCategoryActionGroup.xml

@@ -64,12 +64,11 @@
 
     <actionGroup name="StorefrontCheckAddToCartButtonAbsence">
         <arguments>
-            <argument name="product"/>
+            <argument name="product" defaultValue="_defaultProduct"/>
         </arguments>
         <moveMouseOver selector="{{StorefrontCategoryProductSection.ProductInfoByName(product.name)}}" stepKey="moveMouseOverProduct" />
         <dontSeeElement selector="{{StorefrontCategoryProductSection.ProductAddToCartByName(product.name)}}" stepKey="checkAddToCartButtonAbsence"/>
     </actionGroup>
-
     <actionGroup name="StorefrontSwitchCategoryViewToListMode">
         <click selector="{{StorefrontCategoryMainSection.modeListButton}}" stepKey="switchCategoryViewToListMode"/>
         <waitForElement selector="{{StorefrontCategoryMainSection.CategoryTitle}}" time="30" stepKey="waitForCategoryReload"/>