Fix import scripts that failed when run with multiple AreaTypes

These import scripts all used QuerySet.get() insted of QuerySet.filter()
which was causing an exception when both WMC and WMC23 AreaTypes were
present in the database.

hub/management/commands/import_cen_nzsg_members.py

@@ -60,7 +60,7 @@ def create_data_types(self):
             },
         )
 
-        for at in AreaType.objects.get(code__in=["WMC", "WMC23"]):
+        for at in AreaType.objects.filter(code__in=["WMC", "WMC23"]):
             nzsg_ds.areas_available.add(at)
             cen_ds.areas_available.add(at)
 

hub/management/commands/import_mp_engagement.py

@@ -54,7 +54,7 @@ def create_data_types(self):
             },
         )
 
-        for at in AreaType.objects.get(code__in=["WMC", "WMC23"]):
+        for at in AreaType.objects.filter(code__in=["WMC", "WMC23"]):
             ds.areas_available.add(at)
 
         data_type, created = DataType.objects.update_or_create(
@@ -79,7 +79,7 @@ def create_data_types(self):
             },
         )
 
-        for at in AreaType.objects.get(code__in=["WMC", "WMC23"]):
+        for at in AreaType.objects.filter(code__in=["WMC", "WMC23"]):
             ds.areas_available.add(at)
 
         data_type, created = DataType.objects.update_or_create(

hub/management/commands/import_mps_appg_data.py

@@ -103,7 +103,7 @@ def create_data_type(self):
             },
         )
 
-        for at in AreaType.objects.get(code__in=["WMC", "WMC23"]):
+        for at in AreaType.objects.filter(code__in=["WMC", "WMC23"]):
             appg_membership_ds.areas_available.add(at)
 
         appg_membership, created = DataType.objects.update_or_create(

hub/management/commands/import_mps_relevant_votes.py

@@ -198,7 +198,7 @@ def create_data_types(self, votes, edms):
                 },
             )
 
-            for at in AreaType.objects.get(code__in=["WMC", "WMC23"]):
+            for at in AreaType.objects.filter(code__in=["WMC", "WMC23"]):
                 ds.areas_available.add(at)
 
             data_type, created = DataType.objects.update_or_create(
@@ -226,7 +226,7 @@ def create_data_types(self, votes, edms):
                     },
                 )
 
-                for at in AreaType.objects.get(code__in=["WMC", "WMC23"]):
+                for at in AreaType.objects.filter(code__in=["WMC", "WMC23"]):
                     ds.areas_available.add(at)
 
                 data_type, created = DataType.objects.update_or_create(

hub/management/commands/import_mps_select_committee_membership.py

@@ -71,7 +71,7 @@ def create_data_types(self):
             },
         )
 
-        for at in AreaType.objects.get(code__in=["WMC", "WMC23"]):
+        for at in AreaType.objects.filter(code__in=["WMC", "WMC23"]):
             select_committee_membership_ds.areas_available.add(at)
 
         select_committee_membership, created = DataType.objects.update_or_create(