ircbot: don't require topic/setter in IrcChannel

one may want to set autojoin for a channel that hasn't yet had topic
stuff logged, so don't require it in the form

dr_botzo/ircbot/migrations/0008_auto_20150521_2113.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ircbot', '0007_auto_20150519_2156'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='ircchannel',
+            name='topic_by',
+            field=models.CharField(default=b'', max_length=200, blank=True),
+        ),
+        migrations.AlterField(
+            model_name='ircchannel',
+            name='topic_msg',
+            field=models.TextField(default=b'', blank=True),
+        ),
+    ]

dr_botzo/ircbot/models.py

@@ -52,9 +52,9 @@ class IrcChannel(models.Model):
     name = models.CharField(max_length=200, unique=True)
     autojoin = models.BooleanField(default=False)
 
-    topic_msg = models.TextField(default='')
+    topic_msg = models.TextField(default='', blank=True)
     topic_time = models.DateTimeField(default=timezone.now)
-    topic_by = models.CharField(max_length=200, default='')
+    topic_by = models.CharField(max_length=200, default='', blank=True)
 
     def __unicode__(self):
         """String representation."""