replace unwrap with if let

Author: antonok-edm

src/engine.rs

@@ -213,11 +213,11 @@ impl Engine {
     /// `hidden_class_id_selectors` to obtain any stylesheets consisting of generic rules (if the
     /// returned `generichide` value is false).
     pub fn url_cosmetic_resources(&self, url: &str) -> UrlSpecificResources {
-        let request = Request::new(url, url, "document");
-        if request.is_err() {
+        let request = if let Ok(request) = Request::new(url, url, "document") {
+            request
+        } else {
             return UrlSpecificResources::empty();
-        }
-        let request = request.unwrap();
+        };
 
         let generichide = self.blocker.check_generic_hide(&request);
         self.cosmetic_cache.hostname_cosmetic_resources(&self.resources, &request.hostname, generichide)