HOT-FIX: tira possibilidade de charfield ser null

sapl/audiencia/migrations/0006_auto_20180808_0856.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.13 on 2018-08-08 11:56
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('audiencia', '0005_auto_20180806_1236'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='audienciapublica',
+            name='hora_fim',
+            field=models.CharField(blank=True, max_length=5, verbose_name='Horário Fim(hh:mm)'),
+        ),
+    ]

sapl/audiencia/models.py

@@ -71,7 +71,7 @@ class AudienciaPublica(models.Model):
     hora_inicio = models.CharField(
         max_length=5, verbose_name=_('Horário Início(hh:mm)'))
     hora_fim = models.CharField(
-        max_length=5, blank=True, null=True, verbose_name=_('Horário Fim(hh:mm)'))
+        max_length=5, blank=True, verbose_name=_('Horário Fim(hh:mm)'))
     observacao = models.TextField(
         max_length=500, blank=True, verbose_name=_('Observação'))
     audiencia_cancelada = models.BooleanField(