Guard against nonexistent Package.ddp.DDP._CurrentMethodInvocation.
Guard against nonexistent Package.ddp.DDP._CurrentMethodInvocation.

In the same way as was done in 88824ca04d637583efec2b45570bda0a3e7da6cc
and as suggested in https://github.com/meteor/meteor/issues/8947.

Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor