remove search_data_js format error logs when there is no search_data_js

Author: ruslandoga

lib/hexdocs/search/search.ex

@@ -41,9 +41,12 @@ defmodule Hexdocs.Search do
         "searchData=" <> json ->
           json
 
-        _ ->
+        _ when is_binary(search_data_js) ->
           Logger.error("Unexpected search_data format for #{package} #{version}")
           nil
+
+        nil ->
+          nil
       end
 
     search_data =