Show error message if no any product slected from recent order group

Author: mageprince

app/code/Magento/Checkout/Controller/Cart/Addgroup.php

@@ -74,6 +74,8 @@ public function execute()
                 }
             }
             $this->cart->save();
+        } else {
+            $this->messageManager->addErrorMessage(__('Please select atleast one product to add to cart'));
         }
         return $this->_goBack();
     }