[PyQt] Crash when sending None in a str signal

[Florian Bruhin]

* Julien Duponchelle <julien at gns3.net> [2016-06-20 08:35:25 +0000]:
> Hi,
> 
> If you send None instead of a str to a signal the application will
> segfault.

I think this is the same as this which will be fixed in
PyQt 5.6.1/5.7:

https://www.riverbankcomputing.com/pipermail/pyqt/2016-April/037375.html
https://www.riverbankcomputing.com/pipermail/pyqt/2016-April/037399.html

> I know the error is from me but due to the fact it's a segfault it's hard
> to locate the issue. It would be easier if a Python exception was raised.

It's not an error I believe, as there's a difference on the Qt side
between an empty and a null QString.

Florian

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