Julian Oes 4e43cc3518 px_uploader.py fix flashing issue (#9792)
This fixes a problem where the pyserial write call gets stuck.
It happens on a specific Fedora 28 system with internal USB ports as
well as USB hubs.
It is not clear why the problem is resolved but it is clearly
reproducible that with a timeout of 0, the write can get stuck and with
a timeout > 0 it works every time.

The exception added as part of this commit makes sense but has never
been triggered in my testing.
2018-06-28 20:18:22 -04:00
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