Fix for a case of empty units and addition of a new item in complements

courses/stats/serializers.py

@@ -58,7 +58,8 @@ class ActionSerializer(serializers.ModelSerializer):
 
     def get_target(self, obj):
         if isinstance(obj.target, LearningObject):
-            if obj.target.unit:
+            if not obj.target.unit:
+                 return ''
             return obj.target.unit.lesson.course.name               
         if isinstance(obj.target, Forum):
             return obj.target.title
@@ -137,4 +138,11 @@ class ActionSerializer(serializers.ModelSerializer):
                 course = 'do curso {}'.format(obj.target.unit.lesson.course.name)
                 compl =  {'atividade': unit, 'etapa': step, 'curso': course}
                 return compl
+        
+        if obj.action_object and obj.target:
+            if isinstance(obj.action_object, Card) and isinstance(obj.target, Classroom): 
+                title =  'o conteúdo {}'.format(obj.action_object.title)
+                classroom = 'na sala {}'.format(obj.target.name)
+                compl =  {'title': title, 'classroom': classroom, 'curso': ''}
+                return compl
         return ''
\ No newline at end of file