Control: close -1

Hi Orion,

I have seen many issues like the one described in #497 recently and  
fixed them on the run. Not sure if the exact code path from #497 got  
fixed, as well.

Please reopen / file anew if such an error reoccurs with the heavily  
updated 0.5.0.0 of Python X2Go.

Thanks+Greets,
Mike

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