src: handle empty Maybe(Local) in node_util.cc
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
make -j4 test
(UNIX), or vcbuild test
(Windows) passes