rustdoc: clean up search.js by removing empty sort case

It's going to be a no-op on the empty list anyway
(we have plenty of test cases that return nothing)
so why send extra code?

Author: notriddle

src/librustdoc/html/static/js/search.js

@@ -1321,11 +1321,6 @@ function initSearch(rawSearchIndex) {
          * @returns {[ResultObject]}
          */
         function sortResults(results, isType, preferredCrate) {
-            // if there are no results then return to default and fail
-            if (results.size === 0) {
-                return [];
-            }
-
             const userQuery = parsedQuery.userQuery;
             const result_list = [];
             for (const result of results.values()) {