Merge pull request '# Bugfix parcel updating' (#79) from master into Docker

Reviewed-on: SGD-Nord/konova#79

konova/utils/wfs/spatial.py

@@ -180,12 +180,15 @@ class ParcelWFSFetcher(AbstractWFSFetcher):
 
             members = collection.get(
                 "wfs:member",
-                [],
+                None,
             )
-            if len(members) > 1:
-                features += members
-            else:
-                features += [members]
+            if members is not None:
+                if len(members) > 1:
+                    # extend feature list with found list of new feature members
+                    features += members
+                else:
+                    # convert single found feature member into list and extent feature list
+                    features += [members]
 
             if collection.get("@next", None) is not None:
                 start_index += self.count