Fixed some issues based on feedback at linux.org.ru

boards/models/post.py

@@ -241,7 +241,7 b' class Post(models.Model):'
 
     def get_title(self):
         title = self.title
-        if len(title) == 0:
+        if not title:
             title = self.text.rendered
 
         return title
@@ -250,7 +250,7 b' class Post(models.Model):'
         return self.referenced_posts.order_by('id')
 
     def is_referenced(self):
-        return self.referenced_posts.all().exists()
+        return self.referenced_posts.exists()
 
     def is_opening(self):
         return self.thread_new.get_opening_post() == self
@@ -369,7 +369,7 b' class Thread(models.Model):'
         Completely delete thread and all its posts
         """
 
-        if self.replies.count() > 0:
+        if self.replies.exists():
             self.replies.all().delete()
 
         self.delete()
@@ -385,7 +385,7 b' class Thread(models.Model):'
             if reply_count > 0:
                 reply_count_to_show = min(settings.LAST_REPLIES_COUNT,
                                           reply_count - 1)
-                last_replies = self.replies.all().order_by(
+                last_replies = self.replies.order_by(
                     'pub_time')[reply_count - reply_count_to_show:]
 
                 return last_replies