show 404 when None is returned

Author: jyn514

src/web/source.rs

@@ -234,6 +234,11 @@ pub fn source_browser_handler(req: &mut Request) -> IronResult<Response> {
     };
 
     let list = FileList::from_path(&conn, &name, &version, &req_path);
+    if list.is_none() {
+        use iron::status;
+        use super::error::Nope;
+        return Err(IronError::new(Nope::NoResults, status::NotFound));
+    }
 
     let page = Page::new(list)
         .set_bool("show_parent_link", !req_path.is_empty())