[QGIS-Developer] Empty or NULL geometry when deleting vertices and sub parts?

[Régis Haubourg]

Hi all,
We encounter different behaviors regarding NULL/Empty geometries and I need
your wisdom lights:
(Using postgis provider here)
- when deleting all the vertices of a geometry we get a NULL geometry
- when deleting all parts of a multiline, when get an empty geometry

I think we should homogenize the behavior here.

Googling a bit led me into the uncertainties of NULL and Empty concepts
into the SFS, WKT, WKB standards, but I fail to decide which one is the
best.
As an average data administrator, I would choose NULL because I almost
never test geometries for being Empty and I think this could be a caveat
for most users.

Someone has any opinion here ?

Best regards

Régis
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