Fix tags: allow empty 'tags' field & save new tags

apps/rp/forms.py

@@ -9,3 +9,9 @@ class TagMultipleChoiceField(forms.ModelMultipleChoiceField):
             return [self.prepare_value(v) for v in value]
         else:
             return super(TagMultipleChoiceField, self).prepare_value(value)
+
+    def clean(self, value):
+        value = self.to_python(value)
+        self.validate(value)
+        self.run_validators(value)
+        return value

apps/rp/migrations/0013_auto_20170428_1341.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2017-04-28 13:41
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import taggit.managers
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('rp', '0012_auto_20170427_1439'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='article',
+            name='lang',
+            field=models.CharField(choices=[('FR', 'French'), ('EN', 'English'), ('NA', 'Other')], default='NA', max_length=50, verbose_name='Language'),
+        ),
+        migrations.AlterField(
+            model_name='article',
+            name='tags',
+            field=taggit.managers.TaggableManager(blank=True, help_text='A comma-separated list of tags.', through='taggit.TaggedItem', to='taggit.Tag', verbose_name='Tags'),
+        ),
+    ]

apps/rp/models/article.py

@@ -57,7 +57,7 @@ class Article(VoteMixin):
     #: priority: True if article have priority
     priority = models.BooleanField(default=False)
 
-    tags = TaggableManager()
+    tags = TaggableManager(blank=True)
 
     class Meta:
         verbose_name = _("Article")

apps/rp/views/articles.py

@@ -83,7 +83,7 @@ class ArticleEdit(UpdateView):
 
         # Change the layout of the tags field
         form.fields["tags"] = TagMultipleChoiceField(
-            queryset=Tag.objects.all())
+            queryset=Tag.objects.all(), required=False)
 
         left_layout = Div(
             Div(