fixes

[redakcja.git] / apps / catalogue / models / book.py

diff --git a/apps/catalogue/models/book.py b/apps/catalogue/models/book.py
index 772b121..4fbd194 100755 (executable)
--- a/apps/catalogue/models/book.py
+++ b/apps/catalogue/models/book.py
@@ -271,6 +271,8 @@ class Book(models.Model):
     def get_on_track(self):
         if self.published:
             return -1
+        if len(self) == 0:
+            return -1
         return min(ch.stage.ordering for ch in self) or 0
     on_track = cached_in_field('_on_track')(get_on_track)