Add __str__ to models, remove null=True in CharField and TextField

apps/member/migrations/0004_replace_null_by_blank.py

@@ -0,0 +1,20 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('member', '0003_create_bde_and_kfet'),
+    ]
+
+    operations = [
+        migrations.RunSQL(
+            "UPDATE member_profile SET address = '' WHERE address IS NULL;",
+        ),
+        migrations.RunSQL(
+            "UPDATE member_profile SET ml_events_registration = '' WHERE ml_events_registration IS NULL;",
+        ),
+        migrations.RunSQL(
+            "UPDATE member_profile SET section = '' WHERE section IS NULL;",
+        ),
+    ]

apps/member/migrations/0005_remove_null_tag_on_charfields.py

@@ -0,0 +1,28 @@
+# Generated by Django 2.2.16 on 2020-09-06 19:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('member', '0004_replace_null_by_blank'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='profile',
+            name='address',
+            field=models.CharField(blank=True, default='', max_length=255, verbose_name='address'),
+        ),
+        migrations.AlterField(
+            model_name='profile',
+            name='ml_events_registration',
+            field=models.CharField(blank=True, choices=[('', 'No'), ('fr', 'Yes (receive them in french)'), ('en', 'Yes (receive them in english)')], default='', max_length=2, verbose_name='Register on the mailing list to stay informed of the events of the campus (1 mail/week)'),
+        ),
+        migrations.AlterField(
+            model_name='profile',
+            name='section',
+            field=models.CharField(blank=True, default='', help_text='e.g. "1A0", "9A♥", "SAPHIRE"', max_length=255, verbose_name='section'),
+        ),
+    ]