[FIX] sql_db: add `closed` property on `Cursor`.

openerp/sql_db.py

@@ -402,6 +402,12 @@ class Cursor(object):
     def __getattr__(self, name):
         return getattr(self._obj, name)
 
+    @property
+    def closed(self):
+        # NOTE: we cannot use `__getattr__` delegation as we
+        #       should not `check` that the cursor is closed
+        return self._obj.closed
+
 class TestCursor(Cursor):
     """ A cursor to be used for tests. It keeps the transaction open across
         several requests, and simulates committing, rolling back, and closing.