improve check: and try to handle URL by URL rewrites if request path is NULL. (#1149)

Author: vmalyk

Model/Product/Url.php

@@ -62,7 +62,7 @@ public function getUrl(Product $product, $params = [])
             $routeParams['_scope'] = $urlDataObject->getStoreId();
         } else {
             $requestPath = $product->getRequestPath();
-            if ($requestPath === '') {
+            if (empty($requestPath) && $requestPath !== false) {
                 $filterData = [
                     UrlRewrite::ENTITY_ID   => $product->getId(),
                     UrlRewrite::ENTITY_TYPE => ProductUrlRewriteGenerator::ENTITY_TYPE,