Memberships url returns null field in written
An example :
http://twiced.fr:15296/blockchain/memberships/HBSSmqZjT4UQKsCntTSmZbu7iRP14HYtifLE6mW1PsBD
{
"pubkey": "HBSSmqZjT4UQKsCntTSmZbu7iRP14HYtifLE6mW1PsBD",
"uid": "Pirion",
"sigDate": 1451772411,
"memberships":
[
{
"version": 1,
"currency": "meta_brouzouf",
"membership": "IN",
"blockNumber": 48697,
"blockHash": "0000085110CF982054BAF8F56D23CEA21F9F4F1C",
"written": null
},
...