Reject decode when src and srcset are missing

Signed-off-by: Bentaimia Haddadi <haddadi.taym@gmail.com>

components/script/dom/htmlimageelement.rs

@@ -1173,6 +1173,7 @@ impl HTMLImageElement {
     // Step 2 for <https://html.spec.whatwg.org/multipage/#dom-img-decode>
     fn react_to_decode_image_sync_steps(&self) {
         let document = document_from_node(self);
+        let elem = self.upcast::<Element>();
         // Step 2.1 of <https://html.spec.whatwg.org/multipage/#dom-img-decode>
         if !document.is_fully_active() ||
             matches!(self.current_request.borrow().state, State::Broken)
@@ -1183,6 +1184,10 @@ impl HTMLImageElement {
             State::CompletelyAvailable
         ) {
             self.resolve_image_decode_promises();
+        } else if !elem.has_attribute(&local_name!("src")) &&
+            !elem.has_attribute(&local_name!("srcset"))
+        {
+            self.reject_image_decode_promises();
         }
     }