Export silently fails if instance.license is set to ""

I just spent a solid two hours digging through my code, through multiple revisions, to find this really weird bug. It turns out that setting GSInstance.license to "" makes the export silently fail. GSInstance.generate() still returns True, but the export just doesn’t show up. Could this be fixed, or at least the generate method return an error message? Thank you very much!

I have fixed it. Thanks.

Thank you! I appreciate the speedy fix a lot.