[btcsuite/btcd] 4cee2a: Separate addrindex tx fetch error messages

[Olaoluwa Osuntokun]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 4cee2a48cc0df440e11bc4e68d057b205bbfd72f
      
https://github.com/btcsuite/btcd/commit/4cee2a48cc0df440e11bc4e68d057b205bbfd72f
  Author: Olaoluwa Osuntokun <laol...@gmail.com>
  Date:   2015-02-18 (Wed, 18 Feb 2015)

  Changed paths:
    M chainindexer.go

  Log Message:
  -----------
  Separate addrindex tx fetch error messages

* Decouple logging and handling of distinct error messages for cases of
failed tx look up.
* This also fixes a bug wherein the `addrindexer` failed to lookup a tx
(since it didn't exist), but continued since the returned error was
nil.