Update python/core/additions/qgsfeature.py

Co-authored-by: Even Rouault <even.rouault@spatialys.com>

python/core/additions/qgsfeature.py

@@ -21,7 +21,7 @@
 
 def mapping_feature(feature):
     geom = feature.geometry()
-    properties = {k: None if (v is None or isinstance(v, QVariant) and v.isNull()) else v for k, v in feature.attributeMap().items()}
+    properties = {k: None if (v is None or (isinstance(v, QVariant) and v.isNull())) else v for k, v in feature.attributeMap().items()}
     return {'type': 'Feature',
             'properties': properties,
             'geometry': geom.__geo_interface__}