Revise Activator error handling. NameAlreadyExist error should not panic.
Revise Activator error handling.
NameAlreadyExist error should not panic.

AsynkronIT/protoactor-go,AsynkronIT/gam,Huawei-PTLab/protoactor-go,Huawei-PTLab/protoactor-go,AsynkronIT/protoactor-go,AsynkronIT/gam,rogeralsing/gam