Ppi fields pdb_id and family can be blank

Former-commit-id: a334477697b35ef6e5ca68ecff70604d49a59c9f

ippisite/db.sqlite3.REMOVED.git-id

-2d91d7b3598964b2d586b4dbc9db6806ea19fff6
\ No newline at end of file
+a95c9b99cc69a1cae8a8fa13dfa234ef88d45f4e
\ No newline at end of file

ippisite/ippidb/migrations/0008_auto_20180727_0845.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2018-07-27 08:45
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ippidb', '0007_auto_20180727_0822'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='ppi',
+            name='family',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='ippidb.PpiFamily'),
+        ),
+        migrations.AlterField(
+            model_name='ppi',
+            name='pdb_id',
+            field=models.CharField(blank=True, max_length=4, null=True, verbose_name='PDB ID'),
+        ),
+    ]

ippisite/ippidb/models.py

@@ -212,12 +212,12 @@ class PpiFamily(models.Model):
 
 
 class Ppi(models.Model):
-    pdb_id = models.CharField('PDB ID', max_length=4, null=True)
+    pdb_id = models.CharField('PDB ID', max_length=4, null=True, blank=True)
     pockets_nb = models.IntegerField(
         'Total number of pockets in the complex', default=1)
     symmetry = models.ForeignKey(Symmetry, models.CASCADE)
     diseases = models.ManyToManyField(Disease)
-    family = models.ForeignKey(PpiFamily, models.CASCADE, null=True)
+    family = models.ForeignKey(PpiFamily, models.CASCADE, null=True, blank=True)
 
     def __str__(self):
         return '{} PPI, PDB:{}'.format(self.symmetry.description, self.pdb_id or 'unknown')