Allow empty datasets

portal/migrations/0019_auto_20200113_1537.py

+# Generated by Django 2.0.13 on 2020-01-13 20:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('portal', '0018_auto_20191206_0739'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='dataset',
+            name='files',
+            field=models.ManyToManyField(blank=True, related_name='datasets', to='portal.DataFile', verbose_name='Files'),
+        ),
+    ]

portal/models.py

@@ -275,7 +275,7 @@ class DataSet(models.Model):
     share_profiles = models.ManyToManyField(Profile, blank=True, related_name='shared_datasets', verbose_name=_('Share with these users'))
     share_labs = models.ManyToManyField(Lab, blank=True, related_name='shared_datasets', verbose_name=_('Share with these labs'))
     share_groups = models.ManyToManyField(ShareGroup, blank=True, related_name='shared_datasets', verbose_name=_('Share with these groups'))
-    files = models.ManyToManyField(DataFile, related_name='datasets', verbose_name=_('Files'))
+    files = models.ManyToManyField(DataFile, related_name='datasets', verbose_name=_('Files'), blank=True)
 
     objects = DataSetManager()