6215: Descendant Fanchart error on duplicate children

svn: r20792

gramps/gui/widgets/fanchartdesc.py

@@ -348,7 +348,11 @@ class FanChartDescWidget(FanChartBaseWidget):
             for data in self.gen2people[gen]:
                 #obtain start and stop of family this is child of
                 parentfamdata = self.gen2fam[gen-1][data[5]]
+                nrdescfam = 0
+                if not parentfamdata[1]:
                     nrdescfam = self.famhandle2desc[parentfamdata[0].handle]
+                nrdesc = 0
+                if not data[1]:
                     nrdesc = self.handle2desc[data[0].handle]
                 famstart = parentfamdata[2]
                 famslice = parentfamdata[3]