windows fixes

oml/item/models.py

@@ -570,8 +570,12 @@ class Item(db.Model):
         for f in self.files.all():
             path = f.fullpath()
             if os.path.exists(path):
-                os.unlink(path)
-                remove_empty_folders(os.path.dirname(path))
+                try:
+                    os.chmod(path, stat.S_IWRITE)
+                    os.unlink(path)
+                    remove_empty_folders(os.path.dirname(path))
+                except:
+                    pass
             state.db.session.delete(f)
         user = state.user()
         if user in self.users: