LibJS: Convert to_u16() to ThrowCompletionOr

Author: https://github.com/IdanHo
Commit: 7bbb92dfe9
Pull-request: https://github.com/SerenityOS/serenity/pull/10522
Reviewed-by: https://github.com/linusg ✅

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp

@@ -1121,9 +1121,7 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
 )~~~");
     } else if (parameter.type->name == "unsigned short") {
         scoped_generator.append(R"~~~(
-    auto @cpp_name@ = @js_name@@js_suffix@.to_u16(global_object);
-    if (vm.exception())
-        @return_statement@
+    auto @cpp_name@ = TRY_OR_DISCARD(@js_name@@js_suffix@.to_u16(global_object));
 )~~~");
     } else if (parameter.type->name == "long") {
         scoped_generator.append(R"~~~(