diff -r 894957e1ce2d -r 52adf66fae7d server/test/unittest_migractions.py
--- a/server/test/unittest_migractions.py	Fri Dec 19 12:39:42 2014 +0100
+++ b/server/test/unittest_migractions.py	Mon Dec 22 14:39:50 2014 +0100
@@ -309,6 +309,8 @@
             self.assertEqual(self.schema['filed_under2'].objects(), ('Folder2',))
             mh.cmd_drop_relation_type('filed_under2')
             self.assertNotIn('filed_under2', self.schema)
+            # this should not crash
+            mh.cmd_drop_relation_type('filed_under2')
 
     def test_add_relation_definition_nortype(self):
         with self.mh() as (cnx, mh):