#2274: cache_model.py, add 'else' case for no model found

Author: jeff1evesque

brain/cache/cache_model.py

@@ -89,7 +89,10 @@ def get_all_titles(self, name):
                 list_title.append({'id': id[i], 'title': title[i]})
 
             # return result
-            return {'result': list_title, 'error': None}
+            if list_title:
+                return {'result': list_title, 'error': None}
+            else:
+                return {'result': None, 'error': 'no previous model found in cache'}
         except Exception, error:
             self.list_error.append(str(error))
             return {'result': None, 'error': self.list_error}