Fix bad validation rules

apps/map/forms.py

@@ -176,7 +176,8 @@ class LongCaseStudyForm(BaseCaseStudyForm):
 
         self.fields['positive_case_type'] = forms.ChoiceField(
             widget=forms.RadioSelect(),
-            choices=POSITIVE_CASE_TYPE_CHOICES
+            choices=POSITIVE_CASE_TYPE_CHOICES,
+            required=False
         )
 
         self.fields['project_owners'].required = True

apps/map/migrations/0060_auto_20180523_1659.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2018-05-23 16:59
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('map', '0059_auto_20180519_1801'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='casestudy',
+            name='project_life_span',
+            field=models.CharField(blank=True, help_text='e.g. 12 years of production, 15 years overall', max_length=200, verbose_name='Project life span'),
+        ),
+    ]

apps/map/models.py

@@ -739,9 +739,7 @@ class CaseStudy(models.Model):
         verbose_name=_("Project life span"),
         help_text=_("e.g. 12 years of production, 15 years overall"),
         max_length=200,
-        default=None,
-        null=True,
-        blank=None
+        blank=True
     )
 
     # 2.3.3.2