ZORG: Default to no submit URL

[Renato Golin]

Folks,

Since most of you are not in Phab, I'm submitting the patch via email.

This is a re-work on my original patch to make the URL default to None
and to not submit unless it's passed down.

Chris,

I hope my python skills are not putting me to shame, but this is how I
believe keeping the order of the parameters should be done. ;)

Tobi,

Are those your bots? If not, where are them?

cheers,
--renato
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