Avoid problems caused PySide2 not available on a number of cases, esp…#22

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fidergo-stephane-gourichon wants to merge 1 commit intoalfiopuglisi:masterfrom fidergo-stephane-gourichon:qt_via_qtpy

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Commits on Jul 12, 2020

Avoid problems caused PySide2 not available on a number of cases, especially the Raspberry Pi OS.
sgourichon
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