[conformal/btcjson] 0ef145: Improve test coverage a bit.

[John C. Vernaleo]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcjson
  Commit: 0ef14522477a573ffd1d53e0ea20c16f0e36a56d
      
https://github.com/conformal/btcjson/commit/0ef14522477a573ffd1d53e0ea20c16f0e36a56d
  Author: John C. Vernaleo <j...@conformal.com>
  Date:   2014-01-06 (Mon, 06 Jan 2014)

  Changed paths:
    M jsoncmd.go
    M jsoncmd_test.go
    M test_coverage.txt

  Log Message:
  -----------
  Improve test coverage a bit.

Fix bug in a json command caught by new test.