workaround for pickle problem

[albertz]

I got the strange error:

AttributeError: 'BeamSearchJob' object has no attribute '_sis_alias_prefixes'

When running a job called OldToNewTranscriptions, which (indirectly only) depends on some output of BeamSearchJob.

Full error: https://gist.github.com/albertz/cb04e53879d43734e9f3fb62b4e09da1

Job code: https://gist.github.com/albertz/8429f7ad06bf32832b7c6ff227598982

The error occurred during unpickling. While debugging, I noticed that it would go into the if sis_id in created_jobs code branch and it had an empty object (_sis_init was never called). So extending the check to if sis_id in created_jobs and vars(created_jobs[sis_id]) fixed the problem for me.

I have not fully unterstand the real issue here and I'm not sure this is the best fix. But anyway.

[JackTemaki]

The vars should never be empty if everything is normal, so this fix is okay for me.

[critias]

Looking at your fix my guess is that there is some circular dependency and your fix now creates a second job.
I can't reproduce the problem, to verify this guess. Pickle and load works fine for me with your given job definition. Could you send me the pkl file?