[Fix] Collection of minor Bugfixes (#417)

User feedback from on-prem installation

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#417

epdb/models.py

@@ -2335,8 +2335,8 @@ class Node(EnviPathModel, AliasMixin, ScenarioMixin, AdditionalInformationMixin)
 
     def get_timeseries_data(self):
         for ai in self.additional_information.all():
-            if ai.__class__.__name__ == "OECD301FTimeSeries":
-                return ai.model_dump(mode="json")
+            if ai.type == "OECD301FTimeSeries":
+                return ai.get().model_dump(mode="json")
 
         return None