Empty value egon fix

* adds support for missing values so that EGON can properly handle these entries

intervention/utils/egon_export.py

@@ -178,6 +178,23 @@ class EgonGmlBuilder:
         reg_date = self.intervention.legal.registration_date
         bind_date = self.intervention.legal.binding_date
 
+        # EGON needs special treatment in case of missing data
+        if reg_office is None:
+            reg_office_element = {}
+        else:
+            reg_office_element = {
+                "@xlink:href": f"http://register.naturschutz.rlp.de/repository/services/referenzliste/1053/{reg_office.atom_id}",
+                "#text": reg_office.long_name
+            }
+
+        if cons_office is None:
+            cons_office_element = {}
+        else:
+            cons_office_element = {
+                "@xlink:href": f"http://register.naturschutz.rlp.de/repository/services/referenzliste/907/{cons_office.atom_id}",
+                "#text": cons_office.long_name
+            }
+
         xml_dict = {
             "wfs:FeatureCollection": {
                 "@xmlns:wfs": "http://www.opengis.net/wfs",
@@ -191,14 +208,8 @@ class EgonGmlBuilder:
                     "oneo:azEintragungsstelle": self.intervention.responsible.conservation_file_number,
                     "oneo:azZulassungsstelle": self.intervention.responsible.registration_file_number,
                     "oneo:bemerkungZulassungsstelle": "",
-                    "oneo:eintragungsstelle": {
+                    "oneo:eintragungsstelle": cons_office_element,
-                        "@xlink:href": f"http://register.naturschutz.rlp.de/repository/services/referenzliste/907/{cons_office.atom_id if cons_office else ''}",
+                    "oneo:zulassungsstelle": reg_office_element,
-                        "#text": cons_office.long_name if cons_office else ""
-                    },
-                    "oneo:zulassungsstelle": {
-                        "@xlink:href": f"http://register.naturschutz.rlp.de/repository/services/referenzliste/1053/{reg_office.atom_id if reg_office else ''}",
-                        "#text": reg_office.long_name if reg_office else ""
-                    },
                     "oneo:ersatzzahlung": self._float_to_localized_string(self._sum_all_payments()),
                     "oneo:kompensationsart": {
                         "@xlink:href": f"http://register.naturschutz.rlp.de/repository/services/referenzliste/88140/{comp_type_code}",