Dear Developers,
I found some strange behaviour of Python expression functions if variable
length parameter list is given (e.g args=-1).
If there is a NULL value among the parameters the function is not called.
See the discussion on
https://gis.stackexchange.com/questions/240470/qgis-expression-function/240480?noredirect=1#comment376061_240480
If it a feature or a bug?
Regards,
Zoltan
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