[perl5-dbi/dbi] df9b14: Fix cases where ShowErrorStatement might not show ...

[Tim Bunce]

  Branch: refs/heads/master
  Home:   https://github.com/perl5-dbi/dbi
  Commit: df9b142f13831f4b8e6970492c6d6d4fa0ac311e
      
https://github.com/perl5-dbi/dbi/commit/df9b142f13831f4b8e6970492c6d6d4fa0ac311e
  Author: Tim Bunce <tim.bu...@pobox.com>
  Date:   2016-04-23 (Sat, 23 Apr 2016)

  Changed paths:
    M Changes
    M DBI.xs

  Log Message:
  -----------
  Fix cases where ShowErrorStatement might not show correct Statement

Also add trace log for set_err_sv when HandleSetErr isn't set