[interchange] * Don't autovivify @fields, even if prior bug fix stopped

[Mike Heins]

commit 6481828c1e42fda17971201dd63fff9dcd701967
Author: Mike Heins <mike at perusion.com>
Date:   Mon Jun 17 15:11:24 2013 -0400

    * Don't autovivify @fields, even if prior bug fix stopped
      problem with @fields == 1.

 lib/Vend/Table/DBI.pm |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/lib/Vend/Table/DBI.pm b/lib/Vend/Table/DBI.pm
index 10ce8e9..5866407 100644
--- a/lib/Vend/Table/DBI.pm
+++ b/lib/Vend/Table/DBI.pm
@@ -1416,6 +1416,9 @@ sub set_row {
 	if ($cfg->{PREFER_NULL}) {
 		for (keys %{$cfg->{PREFER_NULL}}) {
 			my $i = $cfg->{COLUMN_INDEX}{$_};
+
+			## We should not autovivify @fields.
+			next unless exists $fields[$i];
 			undef $fields[$i] if $fields[$i] eq '';
 		}
 	}