another nil check in libAsync

Author manavortex <manavortex@gmail.com>
Author date 2018-03-02 09:28:11
Author local date 2018-03-02 10:28:11 +0100
Committer manavortex <manavortex@gmail.com>
Committer date 2018-03-02 09:28:11
Committer local date 2018-03-02 10:28:11 +0100
Commit cc7f8c94d03842a34f73d826e7455d97247705b7
Tree e6a1b5cfa521c168923474d220774afcf196b358
Parent 6ebd0f4f65629f0f18e68d569a557747dcdb31b4
another nil check in libAsync