wallet2::load correctly initialize m_blockchain for wallet loaded without bin file
wallet2::load correctly initialize m_blockchain for wallet loaded without bin file

Fix for simplewallet loading a wallet with a keys file but no bin file.

  - this situation previously required a user to restart simplewallet
    before it would refresh its blockchain from the server.

ranok/bitmonero,eiabea/bitmonero,ranok/bitmonero,eiabea/bitmonero,ranok/bitmonero,eiabea/bitmonero,ranok/bitmonero,eiabea/bitmonero,ranok/bitmonero,ranok/bitmonero,eiabea/bitmonero,eiabea/bitmonero