[Processing] bugfix: intersection QGIS algorithm

fixing this by testing int_com. ``` Traceback (most recent call last): File "C:/PROGRA~1/QGIS2~1.17/apps/qgis/./python/plugins\processing\core\GeoAlgorithm.py", line 203, in execute self.processAlgorithm(progress) File "C:/PROGRA~1/QGIS2~1.17/apps/qgis/./python/plugins\processing\algs\qgis\Intersection.py", line 100, in processAlgorithm int_geom = QgsGeometry(int_com.difference(int_sym)) ``` AttributeError: 'NoneType' object has no attribute 'difference' (cherry picked from commit 3661bc3)
qgis · Sep 19, 2016 · 5b57317 · 5b57317
1 parent bf00878
commit 5b57317
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/python/plugins/processing/algs/qgis/Intersection.py b/python/plugins/processing/algs/qgis/Intersection.py
@@ -96,8 +96,10 @@ def processAlgorithm(self, progress):
                     int_geom = QgsGeometry(geom.intersection(tmpGeom))
                     if int_geom.wkbType() == QGis.WKBUnknown or QgsWKBTypes.flatType(int_geom.geometry().wkbType()) == QgsWKBTypes.GeometryCollection:
                         int_com = geom.combine(tmpGeom)
-                        int_sym = geom.symDifference(tmpGeom)
-                        int_geom = QgsGeometry(int_com.difference(int_sym))
+                        int_geom = QgsGeometry()
+                        if int_com is not None:
+                            int_sym = geom.symDifference(tmpGeom)
+                            int_geom = QgsGeometry(int_com.difference(int_sym))
                     if int_geom.isGeosEmpty() or not int_geom.isGeosValid():
                         ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
                                                self.tr('GEOS geoprocessing error: One or '