diff --git a/gracedb/annotations/voevent_utils.py b/gracedb/annotations/voevent_utils.py
index b675dddd65be6d81bcdcef63c211e7ee025df29b..6c0f5a8c11fe5c060cf9eeee397b75e8cbf9eb0c 100644
--- a/gracedb/annotations/voevent_utils.py
+++ b/gracedb/annotations/voevent_utils.py
@@ -291,6 +291,7 @@ def construct_voevent_file(obj, voevent, request=None):
         if (is_superevent(obj) and voevent.raven_coinc):
             ext_id = obj.em_type
             ext_event = Event.getByGraceid(ext_id)
+            emcoinc_params = []
 
             ## External GCN ID
             if ext_event.trigger_id:
diff --git a/gracedb/api/v1/superevents/serializers.py b/gracedb/api/v1/superevents/serializers.py
index ca55342335525826989f3170f778fd6e506cac4c..352a7a8295a553b6643f5d5fad4cc2922aebf167 100644
--- a/gracedb/api/v1/superevents/serializers.py
+++ b/gracedb/api/v1/superevents/serializers.py
@@ -612,7 +612,7 @@ class SupereventVOEventSerializer(serializers.ModelSerializer):
         super(SupereventVOEventSerializer, self).__init__(*args, **kwargs)
         read_only_fields = ['file_version', 'filename', 'ivorn',
             'coinc_comment', 'prob_has_ns', 'prob_has_remnant', 'prob_bns',
-            'prob_nsbh', 'prob_bbh', 'prob_terrestrial', 'prob_mass_gap']
+            'prob_nsbh', 'prob_bbh', 'prob_terrestrial', 'prob_mass_gap', ]
         for f in read_only_fields:
             self.fields.get(f).read_only = True
 
diff --git a/gracedb/superevents/migrations/0006_add_raven_voevent_sevent_fields.py b/gracedb/superevents/migrations/0006_add_raven_voevent_sevent_fields.py
index 34342c173b70a227c0c8f26345c6f821d2d4878f..bbeaac50d4dc31e1129f6c4ce7b496ac7cf21ca3 100644
--- a/gracedb/superevents/migrations/0006_add_raven_voevent_sevent_fields.py
+++ b/gracedb/superevents/migrations/0006_add_raven_voevent_sevent_fields.py
@@ -67,5 +67,5 @@ class Migration(migrations.Migration):
             model_name='voevent',
             name='ivorn',
             field=models.CharField(blank=True, default='', editable=False, max_length=300),
-        )
+        ),
     ]