If the first thread is created with not section existing yet, default tag will be added if it is the only one specified

boards/forms.py

@@ -418,10 +418,19 b' class ThreadForm(PostForm):'
             raise forms.ValidationError(
                 _('Inappropriate characters in tags.'))
 
+        default_tag_name = board_settings.get('Forms', 'DefaultTag')\
+                .strip().lower()
+
         required_tag_exists = False
         tag_set = set()
         for tag_string in tags.split():
-            tag, created = Tag.objects.get_or_create(name=tag_string.strip().lower())
+            if tag_string.strip().lower() == default_tag_name:
+                required = True
+                required_tag_exitst = True
+            else:
+                required = False
+            tag, created = Tag.objects.get_or_create(
+                    name=tag_string.strip().lower(), required=required)
             tag_set.add(tag)
 
             # If this is a new tag, don't check for its parents because nobody
@@ -434,9 +443,8 b' class ThreadForm(PostForm):'
                 required_tag_exists = True
                 break
 
+        # Use default tag if no section exists
         if not required_tag_exists:
-            default_tag_name = board_settings.get('Forms', 'DefaultTag')\
-                    .strip().lower()
             default_tag, created = Tag.objects.get_or_create(
                     name=default_tag_name, required=True)
             tag_set.add(default_tag)