AK+Everywhere: Use Optional for URLParser::parse's base_url parameter

Author: https://github.com/networkException
Commit: 9915fa72fb
Pull-request: https://github.com/SerenityOS/serenity/pull/18287
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibWeb/HTML/Location.cpp

@@ -312,7 +312,7 @@ WebIDL::ExceptionOr<void> Location::set_hash(String const& value)
     copy_url.set_fragment("");
 
     // 6. Basic URL parse input, with copyURL as url and fragment state as state override.
-    auto result_url = URLParser::parse(input, nullptr, copy_url, URLParser::State::Fragment);
+    auto result_url = URLParser::parse(input, {}, copy_url, URLParser::State::Fragment);
 
     // 7. If copyURL's fragment is this's url's fragment, then return.
     if (copy_url.fragment() == this->url().fragment())