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adding default image to model + fix on vote name display within admin (may break previous polls in db when trying to delete them)

djangoldp_polls/migrations/0003_auto_20200814_0959.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.29 on 2020-08-14 09:59
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('djangoldp_polls', '0002_poll_circle'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='poll',
+            name='circle',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='polls', to='djangoldp_circle.Circle'),
+        ),
+        migrations.AlterField(
+            model_name='poll',
+            name='debate',
+            field=models.ManyToManyField(blank=True, related_name='polls', to='djangoldp_conversation.Conversation'),
+        ),
+        migrations.AlterField(
+            model_name='poll',
+            name='tags',
+            field=models.ManyToManyField(blank=True, related_name='polls', to='djangoldp_polls.Tag'),
+        ),
+        migrations.AlterField(
+            model_name='vote',
+            name='user',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='votes', to=settings.AUTH_USER_MODEL),
+        ),
+    ]