konova/forms/geometry_form.py

@@ -54,7 +54,7 @@ class SimpleGeomForm(BaseForm):
             geom = json.dumps(geojson)
         except AttributeError:
             # If no geometry exists for this form, we simply set the value to None and zoom to the maximum level
-            geom = json.dumps({})
+            geom = ""
             self.empty = True
 
         self.initialize_form_field("output", geom)
@@ -72,12 +72,20 @@ class SimpleGeomForm(BaseForm):
         self.initialize_form_field("output", json.dumps(submitted_data))
 
         # Get geojson from form for validity checking
-        geom = self.data.get("output", json.dumps({}))
-        geom = json.loads(geom)
+        geom = self.data.get("output", None)
+        geom_is_empty = geom is None or len(geom) == 0
+        if geom_is_empty:
+            # If no geometry has been submitted, we create an empty geometry object since
+            # an empty geometry is a valid geometry
+            self.cleaned_data["output"] = MultiPolygon(srid=DEFAULT_SRID_RLP).ewkt
+            return is_valid
 
         # Initialize features list with empty MultiPolygon, so that an empty input will result in a
         # proper empty MultiPolygon object
         features = []
+
+        # Prepare geometry for validity checks (create iterable dict)
+        geom = json.loads(geom)
         features_json = geom.get("features", [])
         accepted_ogr_types = [
             "Polygon",
@@ -133,7 +141,6 @@ class SimpleGeomForm(BaseForm):
         if features:
             form_geom = MultiPolygon(*features, srid=DEFAULT_SRID_RLP).unary_union
         else:
-            # If no features have been processed, this indicates an empty geometry - so we store an empty geometry
             form_geom = MultiPolygon(srid=DEFAULT_SRID_RLP)
 
         # Make sure to convert into a MultiPolygon. Relevant if a single Polygon is provided.