fix minor errors

aircox_programs/admin.py

@@ -113,6 +113,7 @@ class DiffusionAdmin (admin.ModelAdmin):
         return qs.exclude(type = Diffusion.Type['unconfirmed'])
 
 
+admin.site.register(Log)
 admin.site.register(Track)
 admin.site.register(Schedule)
 

aircox_programs/models.py

@@ -8,6 +8,7 @@ from django.utils.html import strip_tags
 
 from taggit.managers import TaggableManager
 
+import aircox_programs.utils as utils
 import aircox_programs.settings as settings
 
 
@@ -541,7 +542,7 @@ class Diffusion (models.Model):
         r = [ sound.duration
                 for sound in self.sounds.filter(type = Sound.Type['archive'])
                 if sound.duration ]
-        return sum(r) or self.duration
+        return utils.time_sum(r) if r else self.duration
 
     def get_archives (self):
         """

aircox_programs/utils.py

@@ -11,7 +11,6 @@ def to_timedelta (time):
         seconds = time.second
     )
 
-
 def seconds_to_time (seconds):
     """
     Seconds to datetime.time
@@ -20,4 +19,12 @@ def seconds_to_time (seconds):
     hours, minutes = divmod(minutes, 60)
     return datetime.time(hour = hours, minute = minutes, second = seconds)
 
+def time_sum (times):
+    """
+    Sum up a list of time elements
+    """
+    seconds = sum([ time.hour * 3600 + time.minute * 60 + time.second
+                    for time in times ])
+    return seconds_to_time(seconds)
+