[IMP] Add / as default value for Initial directory of read and Initial directory of write fields

cmis/cmis_model.py

@@ -157,5 +157,9 @@ class cmis_backend(orm.Model):
             size=128,
             help="Initial directory of write."),
     }
+    _default = {
+        'initial_directory_read': '/',
+        'initial_directory_write': '/',
+    }
 
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