[PyKDE] None as a string argument

[Anthony Heading]

Hi,

The latest pyqt (3.15) with sip 4.3.1 seems to disallow None to be passed
into any Qt function expecting a QString.  For example, adding a line
to tut1.py:
    button.setText(None)
produced a blank button in earlier pyqt releases, but now gives an error:
    Runtime Error: cannot pass None as argument 0 in this call

Is this an intended change?

(Also, the 0-based error message is intentional, or off-by-one?)

Rgds

Anthony

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