removes some bugs

photograb/store.py

@@ -4,6 +4,8 @@ import shutil
 import os
 import time
 
+from .utils import print_warning
+
 
 class Content(dict):
 
@@ -100,4 +102,4 @@ class Backup(Store):
         self.trash.move_content(content)
 
     def clean_trash(self):
-        raise NotImplementedError
+        print_warning("Fake cleaning !")