models: allow LayerBranch.collection to be blank

It's really irritating to be forced to specify a value for this field
especially as it'll get auto-populated by the update script. Set
blank=True to allow that. While we're at it, touch up the description a
bit to make more sense.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/layerindex/migrations/0009_layerbranch_collection.py b/layerindex/migrations/0009_layerbranch_collection.py
new file mode 100644
index 0000000000..bf6276f5da
--- /dev/null
+++ b/layerindex/migrations/0009_layerbranch_collection.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('layerindex', '0008_yp_compatible'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='layerbranch',
+            name='collection',
+            field=models.CharField(help_text='Name of the collection that the layer provides for the purpose of expressing dependencies (as specified in BBFILE_COLLECTIONS). Can only contain letters, numbers and dashes.', max_length=40, blank=True, null=True, verbose_name='Layer Collection'),
+        ),
+    ]