diff --git a/src/auditlog/middleware.py b/src/auditlog/middleware.py
index 269f756..5f6366b 100644
--- a/src/auditlog/middleware.py
+++ b/src/auditlog/middleware.py
@@ -1,6 +1,7 @@
 from django.conf import settings
 from django.db.models.signals import pre_save
 from django.utils.functional import curry
+from django.db.models.loading import get_model
 from auditlog.models import LogEntry
 
 
@@ -37,5 +38,10 @@ class AuditlogMiddleware(object):
         Signal receiver with an extra, required 'user' kwarg. This method becomes a real (valid) signal receiver when
         it is curried with the actor.
         """
-        if sender == LogEntry and isinstance(user, settings.AUTH_USER_MODEL) and instance.actor is None:
+        try:
+            app_label, model_name = settings.AUTH_USER_MODEL.split('.')
+            auth_user_model = get_model(app_label, model_name)
+        except:
+            auth_user_model = get_model('auth', 'user')
+        if sender == LogEntry and isinstance(user, auth_user_model) and instance.actor is None:
             instance.actor = user
diff --git a/src/auditlog/models.py b/src/auditlog/models.py
index 7833817..58d8cc1 100644
--- a/src/auditlog/models.py
+++ b/src/auditlog/models.py
@@ -1,3 +1,5 @@
+import json
+
 from django.conf import settings
 from django.contrib.contenttypes import generic
 from django.contrib.contenttypes.models import ContentType
@@ -40,6 +42,11 @@ class LogEntryManager(models.Manager):
 
             return self.create(**kwargs)
         return None
+        
+    def get_entries_from_model(self, model):
+        content_type = ContentType.objects.get_for_model(model)
+        object_id = model.pk
+        return self.get_query_set().filter(content_type=content_type, object_id=object_id)
 
 
 class LogEntry(models.Model):
@@ -93,6 +100,13 @@ class LogEntry(models.Model):
 
         return fstring.format(repr=self.object_repr)
 
+    def html_formated_changes(self):
+        changes_result = []
+        changes_dict = json.loads(self.changes.encode('utf-8'))
+        for field, changes in changes_dict.items():
+            changes_result.append('<strong>%s</strong> from %s <strong>to</strong> %s' % (field, changes[0], changes[1]))
+        return changes_result
+        
 
 class AuditlogHistoryField(generic.GenericRelation):
     """
diff --git a/src/auditlog/receivers.py b/src/auditlog/receivers.py
index 84cfde3..c9e6ea5 100644
--- a/src/auditlog/receivers.py
+++ b/src/auditlog/receivers.py
@@ -35,11 +35,13 @@ def log_update(sender, instance, **kwargs):
 
             changes = model_instance_diff(old, new)
 
-            log_entry = LogEntry.objects.log_create(
-                instance,
-                action=LogEntry.Action.UPDATE,
-                changes=json.dumps(changes),
-            )
+            # Log an entry only if there are changes
+            if changes:
+                log_entry = LogEntry.objects.log_create(
+                    instance,
+                    action=LogEntry.Action.UPDATE,
+                    changes=json.dumps(changes),
+                )
 
 
 def log_delete(sender, instance, **kwargs):