remove unused variable em_uuids

Author: danielfeismann

pypsdm/models/input/container/participants.py

@@ -72,19 +72,6 @@ def filter_by_nodes(
         evcs = self.evcs.filter_by_nodes(node_uuids)
         hps = self.hps.filter_by_nodes(node_uuids)
 
-        em_uuids = pd.concat(
-            [
-                loads.em,
-                fixed_feed_ins.em,
-                pvs.em,
-                biomass_plants.em,
-                wecs.em,
-                storages.em,
-                evcs.em,
-                hps.em,
-            ]
-        )
-
         return SystemParticipantsContainer(
             EnergyManagementSystems.create_empty(),
             loads,