Make statement field in corporate endorsement not required

ECOM-6544

course_discovery/apps/course_metadata/migrations/0042_auto_20170119_0918.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.11 on 2017-01-19 09:18
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('course_metadata', '0041_organization_certificate_logo_image_url'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='corporateendorsement',
+            name='statement',
+            field=models.TextField(blank=True, null=True),
+        ),
+    ]

course_discovery/apps/course_metadata/models.py

@@ -558,7 +558,7 @@ class Endorsement(TimeStampedModel):
 
 class CorporateEndorsement(TimeStampedModel):
     corporation_name = models.CharField(max_length=128, blank=False, null=False)
-    statement = models.TextField(blank=False, null=False)
+    statement = models.TextField(null=True, blank=True)
     image = models.ForeignKey(Image, blank=True, null=True)
     individual_endorsements = SortedManyToManyField(Endorsement)