member account creation with "double" pseudonym
On the creation of a member account, if one asks for a pseudonym that has already been asked (but not already registered), Cesium gives an error : "Pseudonyme non disponible", even if the previous ID has been revoked.
However, this case might be a human error , f.ex. if one wants the same pseudonym on another account.
In the DUP, pseudonyms are available while not written in the Blockchain, there is nothing preventing two ID documents with same pseudonyms in the pool.
Workaround : create a "wallet" account, and transform it to a "member" account. It might be related to #799, as both appear while transforming a "wallet" account to a "member" account.