File "/Users/mike/.cache/pants/setup/bootstrap/pants.bqIYpd/install/lib/python2.7/site-packages/pants/backend/jvm/tasks/jar_publish.py", line 506, in _ivy_jvm_options
    jvm_options.append('-Dlogin={}'.format(user))

Exception message: 'NoneType' object has no attribute ‘append’