[conformal/btcwallet] a70247: Check for nil to prevent panic.

[John C. Vernaleo]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcwallet
  Commit: a702473c5711ab18144913d534f7dc94c02ed503
      
https://github.com/conformal/btcwallet/commit/a702473c5711ab18144913d534f7dc94c02ed503
  Author: John C. Vernaleo <j...@conformal.com>
  Date:   2015-01-14 (Wed, 14 Jan 2015)

  Changed paths:
    M rpcserver.go

  Log Message:
  -----------
  Check for nil to prevent panic.

ok jrick@