[Qgis-developer] Difference between two layers doesn't remove any features

[Etienne Trimaille]

Hi dev,

I'm using qgis master and I'm trying to use the difference tool between two
layers (from the vector menu and processing).

On the map canvas, the result looks fine, I get less features displayed.
However my result layer contains exactly the same number of features than
my original layer.

Running the "check validity" from processing, I get a lot of "Unknown
geometry type 0".
I can't use this layer in any processing algorithm :

"QgsFeature.setGeometry(QgsGeometry): argument 1 has unexpected type
'NoneType'"

I don't know which algorithms may be affected by this kind of bug.

It's working fine on qgis 2.8.

Regards,
Etienne
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