[PATCH 3/7] v2writable: ->purge returns undef on no-op

[Eric Wong <e@80x24.org>]

And doesn't try to access undef as an array ref.
---
 lib/PublicInbox/V2Writable.pm | 2 +-
 t/v2writable.t                | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index 222df5c..08d18fc 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -390,7 +390,7 @@ sub purge {
 	my ($self, $mime) = @_;
 	my $purges = $self->{-inbox}->with_umask(sub {
 		remove_internal($self, $mime, undef, {});
-	});
+	}) or return;
 	$self->idx_init if @$purges; # ->done is called on purges
 	for my $i (0..$#$purges) {
 		defined(my $cmt = $purges->[$i]) or next;
diff --git a/t/v2writable.t b/t/v2writable.t
index ec9f56d..f171417 100644
--- a/t/v2writable.t
+++ b/t/v2writable.t
@@ -247,6 +247,9 @@ EOF
 	ok(my $cmts = $im->purge($mime), 'purged message');
 	like($cmts->[0], qr/\A[a-f0-9]{40}\z/, 'purge returned current commit');
 	$im->done;
+
+	# again
+	is($im->purge($mime), undef, 'no-op returns undef');
 }
 
 {
-- 
EW