Fix default value of place_of_birth

aleksis/core/migrations/0028_default_value_place_of_birth.py

+# Generated by Django 3.2.10 on 2021-12-15 20:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0027_person_place_of_birth'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='person',
+            name='place_of_birth',
+            field=models.CharField(blank=True, default='', max_length=255, verbose_name='Place of birth'),
+            preserve_default=False,
+        ),
+    ]

aleksis/core/models.py

@@ -195,7 +195,7 @@ class Person(ExtensibleModel):
 
     date_of_birth = models.DateField(verbose_name=_("Date of birth"), blank=True, null=True)
     place_of_birth = models.CharField(
-        verbose_name=_("Place of birth"), max_length=255, blank=True, null=True
+        verbose_name=_("Place of birth"), max_length=255, blank=True
     )
     sex = models.CharField(verbose_name=_("Sex"), max_length=1, choices=SEX_CHOICES, blank=True)